ARM: rmobile: Switch back to fdtdec_setup_memory/banksize_fdt()

The commit 361377dbdbc9 ("ARM: rmobile: Merge prior-stage firmware DT
fragment into U-Boot DT on Gen3") reverted changes introduced by commit
175f5027345c ("ARM: renesas: Configure DRAM size from ATF DT fragment")
that's why there is no reason to use functions with _fdt() suffix because
parameter is gd->fdt_blob as is already for functions without _fdt()
suffix.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/renesas/rcar-common/common.c b/board/renesas/rcar-common/common.c
index 9f50f36..83dd288 100644
--- a/board/renesas/rcar-common/common.c
+++ b/board/renesas/rcar-common/common.c
@@ -33,12 +33,12 @@
 
 int dram_init(void)
 {
-	return fdtdec_setup_mem_size_base_fdt(gd->fdt_blob);
+	return fdtdec_setup_mem_size_base();
 }
 
 int dram_init_banksize(void)
 {
-	fdtdec_setup_memory_banksize_fdt(gd->fdt_blob);
+	fdtdec_setup_memory_banksize();
 
 	return 0;
 }