tests: benchmarks: system_off: more with retained mem

Add checking grtc with retained mem (4k, 16k, 32k).
Extend checking checking with retained 16k and 32k.

Signed-off-by: Piotr Kosycarz <piotr.kosycarz@nordicsemi.no>

Author: nordic-piks

tests/benchmarks/current_consumption/system_off/boards/nrf52840dk_nrf52840_retain_16k.overlay

@@ -0,0 +1,22 @@
+/ {
+	sram0@2003C000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x2003C000 DT_SIZE_K(16)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemdevice = &retainedmem0;
+	};
+};
+
+&sram0 {
+	/* Shrink SRAM size to avoid overlap with retained memory region */
+	reg = <0x20000000 DT_SIZE_K(240)>;
+};

tests/benchmarks/current_consumption/system_off/boards/nrf52840dk_nrf52840_retain_32k.overlay

@@ -0,0 +1,22 @@
+/ {
+	sram0@20038000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x20038000 DT_SIZE_K(32)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemdevice = &retainedmem0;
+	};
+};
+
+&sram0 {
+	/* Shrink SRAM size to avoid overlap with retained memory region */
+	reg = <0x20000000 DT_SIZE_K(224)>;
+};

tests/benchmarks/current_consumption/system_off/boards/nrf52840dk_nrf52840.overlay renamed to tests/benchmarks/current_consumption/system_off/boards/nrf52840dk_nrf52840_retain_4k.overlay

@@ -0,0 +1,25 @@
+/ {
+	cpuapp_sram@20014000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x20014000 DT_SIZE_K(16)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemdevice = &retainedmem0;
+	};
+};
+
+&cpuapp_sram {
+	/* Shrink SRAM size to avoid overlap with retained memory region:
+	 * 96 - 16 = 80KB = 0x14000
+	 */
+	reg = <0x20000000 0x014000>;
+	ranges = <0x0 0x20000000 0x014000>;
+};

tests/benchmarks/current_consumption/system_off/boards/nrf52dk_nrf52832.overlay renamed to tests/benchmarks/current_consumption/system_off/boards/nrf52dk_nrf52832_retain_4k.overlay

@@ -0,0 +1,25 @@
+/ {
+	cpuapp_sram@2002c000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x2002c000 DT_SIZE_K(16)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemdevice = &retainedmem0;
+	};
+};
+
+&cpuapp_sram {
+	/* Shrink SRAM size to avoid overlap with retained memory region:
+	 * 192 - 16 = 176KB = 0x2c000
+	 */
+	reg = <0x20000000 0x2c000>;
+	ranges = <0x0 0x20000000 0x2c000>;
+};

tests/benchmarks/current_consumption/system_off/boards/nrf54l15dk_nrf54l05_cpuapp_retain_16k.overlay

@@ -0,0 +1,25 @@
+/ {
+	cpuapp_sram@20028000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x20028000 DT_SIZE_K(32)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemdevice = &retainedmem0;
+	};
+};
+
+&cpuapp_sram {
+	/* Shrink SRAM size to avoid overlap with retained memory region:
+	 * 192 - 32 = 160KB = 0x28000
+	 */
+	reg = <0x20000000 0x28000>;
+	ranges = <0x0 0x20000000 0x28000>;
+};

tests/benchmarks/current_consumption/system_off/boards/nrf54l15dk_nrf54l05_cpuapp.overlay renamed to tests/benchmarks/current_consumption/system_off/boards/nrf54l15dk_nrf54l05_cpuapp_retain_4k.overlay

@@ -0,0 +1,23 @@
+/ {
+	cpuapp_sram@2002b000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x2002b000 DT_SIZE_K(16)>;
+		zephyr,memory-region = "RetainedMem";
+		status = "okay";
+
+		retainedmem0: retainedmem {
+			compatible = "zephyr,retained-ram";
+			status = "okay";
+		};
+	};
+
+	aliases {
+		retainedmemdevice = &retainedmem0;
+	};
+};
+
+&cpuapp_sram {
+	/* Shrink SRAM size to avoid overlap with retained memory region */
+	reg = <0x20000000 DT_SIZE_K(172)>;
+	ranges = <0x0 0x20000000 0x2b000>;
+};