hal/nxp: s32K344: flash_c40: add C40 features, IP aliases; init ret

- fsl_c40_flash.c: Initialize `ret` in FLASH_Erase() to
  `kStatus_FLASH_Success` to avoid potential use-before-set warnings on some
  toolchains/static analyzers (no functional change).

- S32K344_features.h: Define C40 array geometry for S32K344 using unsigned
  constants:
    * FSL_FEATURE_FLASH_C40_BLOCK_SIZE_CODE (1 MiB)
    * FSL_FEATURE_FLASH_C40_BLOCK_COUNT_CODE (4)
    * FSL_FEATURE_FLASH_C40_BLOCK_SIZE_DATA (256 KiB)
  Note: erase/program granularities are controller-level and handled by driver.

- S32K344_glue_mcux.h: Provide conditional aliases mapping FLASH↔IP_FLASH and
  PFLASH↔IP_PFLASH to harmonize SDK naming and improve build portability.

Signed-off-by: Sumit Batra <sumit.batra@nxp.com>

Author: sumitbatra-nxp

mcux/mcux-sdk-ng/drivers/flash_c40/fsl_c40_flash.c

@@ -818,7 +818,7 @@ status_t FLASH_Erase(flash_config_t *config, uint32_t start, uint32_t lengthInBy
 
 status_t FLASH_Program(flash_config_t *config, uint32_t start, uint32_t *src, uint32_t lengthInBytes)
 {
-    status_t ret;
+    status_t ret = kStatus_FLASH_Success;
     size_t chunkSize;
     size_t sizeLeft = lengthInBytes;
     uint8_t *src8 = (uint8_t *) src;

s32/mcux/devices/S32K344/S32K344_features.h

@@ -236,4 +236,13 @@
 /* @brief Memory map has offset between subsystems. */
 #define FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET (1)
 
+/* FLASH Module features */
+
+/* @brief Code flash (PFLASH) implemented as 1 MiB blocks */
+#define FSL_FEATURE_FLASH_C40_BLOCK_SIZE_CODE     (1024u * 1024u)
+/* @brief Code flash (PFLASH) has 4 blocks of 1 MiB each total size = 4 MiB */
+#define FSL_FEATURE_FLASH_C40_BLOCK_COUNT_CODE    (4u)
+/* @brief Data flash (DFLASH) window: 256 KiB */
+#define FSL_FEATURE_FLASH_C40_BLOCK_SIZE_DATA     (256u * 1024u)
+
 #endif /* _S32K344_FEATURES_H_ */

s32/mcux/devices/S32K344/S32K344_glue_mcux.h

@@ -208,4 +208,14 @@
 #define FLEXIO_BASE_PTRS                        IP_FLEXIO_BASE_PTRS
 /** Interrupt vectors for the FLEXIO peripheral type */
 #define FLEXIO_IRQS                              { FLEXIO_IRQn }
+
+/* FLASH, PFLASH IP base addresses */
+#if !defined(FLASH)  && defined(IP_FLASH)
+/* C40 Flash Memory Base Address */
+#define FLASH  IP_FLASH
+#endif
+#if !defined(PFLASH) && defined(IP_PFLASH)
+/* Flash Memory Controller Base Address */
+#define PFLASH IP_PFLASH
+#endif
 #endif  /* _S32K344_GLUE_MCUX_H_ */