boards: shields: adjust GLCDC panel timing parameters

Adjust GLCDC panel timing parameters for
rtklcdpar1s00001be display shield

Author: khaicaorvc

boards/shields/rtklcdpar1s00001be/boards/ek_ra8p1_r7ka8p1kflcac_cm85.overlay

@@ -65,9 +65,13 @@
 	interrupt-names = "line";
 	pinctrl-0 = <&glcdc_default>;
 	pinctrl-names = "default";
-	output-pin-hsync = "TCON_PIN_1";
-	output-pin-vsync = "TCON_PIN_0";
+	output-pin-hsync = "TCON_PIN_NONE";
+	output-pin-vsync = "TCON_PIN_NONE";
 	output-pin-de = "TCON_PIN_2";
+	output-clock-divisor = <4>;
+	def-back-color-red = <0>;
+	def-back-color-green = <0>;
+	def-back-color-blue = <0>;
 };
 
 &iic1 {

boards/shields/rtklcdpar1s00001be/rtklcdpar1s00001be.overlay

@@ -37,15 +37,15 @@
 
 	display-timings {
 		compatible = "zephyr,panel-timing";
-		hsync-len = <1>;
-		hback-porch = <140>;
-		vsync-len = <1>;
-		vback-porch = <20>;
+		hsync-len = <4>;
+		hback-porch = <160>;
+		vsync-len = <3>;
+		vback-porch = <23>;
 		hsync-active = <0>;
 		vsync-active = <0>;
 		de-active = <1>;
 		pixelclk-active = <0>;
-		hfront-porch = <179>;
-		vfront-porch = <403>;
+		hfront-porch = <156>;
+		vfront-porch = <9>;
 	};
 };