stm32f7: board: Fix memory init

Commit 1473b12ad0 ("lib: fdtdec: Update ram_base to store ram start
adddress") brings regression on STM32F7 which can't boot.

Use fdtdec_setup_mem_size_base() to setup memory base and size.
Use fdtdec_setup_memory_banksize() to setup memory bank base and size.

Reported-by: Mark Olsson <mark@markolsson.se>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Cc: Mark Olsson <mark@markolsson.se>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>

board/st/stm32f746-disco/stm32f746-disco.c

@@ -21,25 +21,10 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int get_memory_base_size(fdt_addr_t *mr_base, fdt_addr_t *mr_size)
-{
-	int mr_node;
-
-	mr_node = fdt_path_offset(gd->fdt_blob, "/memory");
-	if (mr_node < 0)
-		return mr_node;
-	*mr_base = fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, mr_node,
-						      "reg", 0, mr_size, false);
-	debug("mr_base = %lx, mr_size= %lx\n", *mr_base, *mr_size);
-
-	return 0;
-}
 int dram_init(void)
 {
-	int rv;
-	fdt_addr_t mr_base, mr_size;
-
 #ifndef CONFIG_SUPPORT_SPL
+	int rv;
 	struct udevice *dev;
 	rv = uclass_get_device(UCLASS_RAM, 0, &dev);
 	if (rv) {
@@ -48,26 +33,12 @@ int dram_init(void)
 	}
 
 #endif
-	rv = get_memory_base_size(&mr_base, &mr_size);
-	if (rv)
-		return rv;
-	gd->ram_size = mr_size;
-	gd->ram_top = mr_base;
-
-	return rv;
+	return fdtdec_setup_mem_size_base();
 }
 
 int dram_init_banksize(void)
 {
-	fdt_addr_t mr_base, mr_size;
-	get_memory_base_size(&mr_base, &mr_size);
-	/*
-	 * Fill in global info with description of SRAM configuration
-	 */
-	gd->bd->bi_dram[0].start = mr_base;
-	gd->bd->bi_dram[0].size  = mr_size;
-
-	return 0;
+	return fdtdec_setup_memory_banksize();
 }
 
 int board_early_init_f(void)