arm64: stm32: enable scmi regulator for stm32

Add SCMI ARM REGULATOR configuration for stm32.
Signed-off-by: Pascal Paillet <p.paillet@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240705134554.2833835-1-alexandre.torgue@foss.st.comSigned-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/Kconfig.platforms

@@ -312,6 +312,8 @@ config ARCH_STM32
 	select STM32_EXTI
 	select ARM_SMC_MBOX
 	select ARM_SCMI_PROTOCOL
+	select REGULATOR
+	select REGULATOR_ARM_SCMI
 	select COMMON_CLK_SCMI
 	select STM32_FIREWALL
 	help