plat/stm32: Use generic fdt_read_uint32_array() implementation

The device tree parsing code for the STM32 platform is using its own FDT
helper functions, some of them being rather generic.
In particular the existing fdt_read_uint32_array() implementation is now
almost identical to the new generic code in fdt_wrappers.c, so we can
remove the ST specific version and adjust the existing callers.

Compared to the original ST implementation the new version takes a
pointer to the DTB as the first argument, and also swaps the order of
the number of cells and the pointer.

Change-Id: Id06b0f1ba4db1ad1f733be40e82c34f46638551a
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/st/stm32mp1/platform.mk b/plat/st/stm32mp1/platform.mk
index 5ce7a9c..b0ba82a 100644
--- a/plat/st/stm32mp1/platform.mk
+++ b/plat/st/stm32mp1/platform.mk
@@ -62,7 +62,8 @@
 
 include lib/libfdt/libfdt.mk
 
-PLAT_BL_COMMON_SOURCES	:=	plat/st/common/stm32mp_common.c				\
+PLAT_BL_COMMON_SOURCES	:=	common/fdt_wrappers.c					\
+				plat/st/common/stm32mp_common.c				\
 				plat/st/stm32mp1/stm32mp1_private.c
 
 PLAT_BL_COMMON_SOURCES	+=	drivers/st/uart/aarch32/stm32_console.S