misc: stm32: Add STM32MP1 support

Following next kernel rcc bindings, we must use a MFD
RCC driver which is able to bind both clock and reset
drivers.

We can reuse and adapt RCC MFD driver already available
for MCU SoCs (F4/F7/H7).

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

include/stm32_rcc.h

@@ -43,6 +43,7 @@ enum soc_family {
 	STM32F42X,
 	STM32F469,
 	STM32F7,
+	STM32MP1,
 };
 
 enum apb {