arm64: Kconfig: expand STM32 Armv8 SoC with STM32MP21/STM32MP23 SoCs family

arm64: Kconfig: expand STM32 Armv8 SoC with STM32MP21/STM32MP23 SoCs family

Expand config ARCH_STM32 with two new SoCs families:
- STM32MP21 SoCs family, which is composed of STM32MP211, STM32MP213 and
  STM32MP215 SoCs;
- STM32MP23 SoCs family, which is composed of STM32MP231, STM32MP233 and
  STM32MP235 SoCs.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20250225-b4-stm32mp2_new_dts-v2-3-1a628c1580c7@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>