Add initial soc support for the stm32mp2x series, including
initial Kconfig entries and default configuration files.
This enables Zephyr to recognize and build for the stm32mp2x series,
taking the stm32mp257f_ev1 as a baseline.
Includes:
- Kconfig and defconfig files for SoC selection and defaults
- soc.h for hal headers
- CMakeLists.txt for build system integration
- soc.yml update to register the new SoC
System Clock is configured statically from DTS. So no initialization
hook or soc.c needed.
Signed-off-by: Youssef Zini <youssef.zini@savoirfairelinux.com>
