feat(st-clock): add STM32MP2 clock driver

This driver manages the clocks on STM32MP2 platforms.
It uses a dedicated RCC (Reset and Clock Control) peripheral.

Change-Id: I6ba2173e73222269a2dfca4c6897229276a150c0
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
diff --git a/plat/st/stm32mp2/stm32mp2_def.h b/plat/st/stm32mp2/stm32mp2_def.h
index e3662ad..d65fcea 100644
--- a/plat/st/stm32mp2/stm32mp2_def.h
+++ b/plat/st/stm32mp2/stm32mp2_def.h
@@ -293,6 +293,11 @@
 #define SYSCFG_BASE				U(0x44230000)
 
 /*******************************************************************************
+ * STM32MP CA35SSC
+ ******************************************************************************/
+#define A35SSC_BASE				U(0x48800000)
+
+/*******************************************************************************
  * REGULATORS
  ******************************************************************************/
 /* 3 PWR + 1 VREFBUF + 14 PMIC regulators + 1 FIXED */