drivers: renesas: rzg: Switch using common ddr code

Switch using common ddr driver code from renesas/common/ddr directory
for RZ/G2M SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Change-Id: I807dcb0bc5186bd32bc1c577945d28634bb10e1f
diff --git a/plat/renesas/rzg/bl2_plat_setup.c b/plat/renesas/rzg/bl2_plat_setup.c
index 13f413b..fe08e7f 100644
--- a/plat/renesas/rzg/bl2_plat_setup.c
+++ b/plat/renesas/rzg/bl2_plat_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Renesas Electronics Corporation. All rights reserved.
+ * Copyright (c) 2020-2021, Renesas Electronics Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -762,7 +762,7 @@
 
 	if (boot_cpu == MODEMR_BOOT_CPU_CA57 ||
 	    boot_cpu == MODEMR_BOOT_CPU_CA53) {
-		ret = rzg_dram_init();
+		ret = rcar_dram_init();
 		if (ret != 0) {
 			NOTICE("BL2: Failed to DRAM initialize (%d).\n", ret);
 			panic();