stm32mp1: do not include platform header files directly in drivers

Instead, only platform_def.h is included.
The required files to be included are added in stm32mp1_def.h.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/drivers/st/clk/stm32mp1_clk.c b/drivers/st/clk/stm32mp1_clk.c
index 7a88986..e4cc9b9 100644
--- a/drivers/st/clk/stm32mp1_clk.c
+++ b/drivers/st/clk/stm32mp1_clk.c
@@ -11,6 +11,8 @@
 
 #include <libfdt.h>
 
+#include <platform_def.h>
+
 #include <arch.h>
 #include <arch_helpers.h>
 #include <common/debug.h>
@@ -25,9 +27,6 @@
 #include <lib/utils_def.h>
 #include <plat/common/platform.h>
 
-#include <stm32mp1_dt.h>
-#include <stm32mp1_private.h>
-
 #define MAX_HSI_HZ	64000000
 
 #define TIMEOUT_200MS	(plat_get_syscnt_freq2() / 5U)