arm: stm32: add new architecture for STM32MP family

- add new arch stm32mp for STM32 MPU/Soc based on Cortex A
- support for stm32mp157 SOC
- SPL is used as first boot stage loader
- using driver model for all the drivers, even in SPL
- all security feature are deactivated (ETZC and TZC)
- reused STM32 MCU drivers when it is possible

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index cc75aec..b7e4ffb 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -234,7 +234,7 @@
 
 config STM32F7_GPIO
 	bool "ST STM32 GPIO driver"
-	depends on DM_GPIO && STM32
+	depends on DM_GPIO && (STM32 || ARCH_STM32MP)
 	default y
 	help
 	  Device model driver support for STM32 GPIO controller. It should be