ARM: stm32: Use different EXTI driver on ARMv7m and ARMv7a

Build the proper driver by selecting the appropriate config flag.
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240620083115.204362-3-antonio.borneo@foss.st.com

arch/arm/mach-stm32/Kconfig

@@ -11,7 +11,8 @@ menuconfig ARCH_STM32
 	select CLKSRC_STM32
 	select PINCTRL
 	select RESET_CONTROLLER
-	select STM32_EXTI
+	select STM32MP_EXTI if ARCH_MULTI_V7
+	select STM32_EXTI if ARM_SINGLE_ARMV7M
 	select STM32_FIREWALL
 	help
 	  Support for STMicroelectronics STM32 processors.