stm32mp1: remove some dependencies on clocks and reset in drivers

Include all RCC, clocks and reset headers from stm32mp1_def.h
which if exported to the firmware through platform_def.h.
The same dependency removal is done in common code as well.
Some useless includes are also removed in stm32_sdmmc2 driver.

Change-Id: I731ea5775c3fdb7f7b0c388b93923ed5e84b8d3f
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/drivers/st/ddr/stm32mp1_ddr_helpers.c b/drivers/st/ddr/stm32mp1_ddr_helpers.c
index a8c1b77..e50b27b 100644
--- a/drivers/st/ddr/stm32mp1_ddr_helpers.c
+++ b/drivers/st/ddr/stm32mp1_ddr_helpers.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2017-2019, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -7,7 +7,6 @@
 #include <platform_def.h>
 
 #include <drivers/st/stm32mp1_ddr_helpers.h>
-#include <drivers/st/stm32mp1_rcc.h>
 #include <lib/mmio.h>
 
 void ddr_enable_clock(void)