Merge "feat(rza): add initial BL2 support for RZ/A platforms" into integration

feat(rza): add initial BL2 support for RZ/A platforms

This patch introduces the initial BL2 support for Renesas RZ/A
platforms. It adds platform-specific sources, drivers, build files,
and memory co

feat(rza): add initial BL2 support for RZ/A platforms

This patch introduces the initial BL2 support for Renesas RZ/A
platforms. It adds platform-specific sources, drivers, build files,
and memory configuration needed to boot via BL2.

Key changes include:
- Board-specific makefiles for RZ/A3M board.
- Platform helpers and BL2 setup routines.
- Drivers for DDR, GPIO, and CPG drivers.
- Platform headers, register definitions, and configuration files.
- Scripts and makefiles for image generation.

Change-Id: I6cea17a76633998d746e7c7c429da9a5bd09ef0c
Signed-off-by: Nhut Nguyen <nhut.nguyen.kc@renesas.com>

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