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/drivers/renesas/common/ddr/ddr_b/boot_init_dram.c b/drivers/renesas/common/ddr/ddr_b/boot_init_dram.c
index ac83c9a..4eb8282 100644
--- a/drivers/renesas/common/ddr/ddr_b/boot_init_dram.c
+++ b/drivers/renesas/common/ddr/ddr_b/boot_init_dram.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2020, Renesas Electronics Corporation.
+ * Copyright (c) 2015-2021, Renesas Electronics Corporation.
  * All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
@@ -36,6 +36,8 @@
 #define RCAR_E3		3	/* NON */
 #define RCAR_H3N	4
 
+#define RZ_G2M		100U
+
 #define RCAR_CUT_10	0
 #define RCAR_CUT_11	1
 #define RCAR_CUT_20	10
@@ -51,7 +53,7 @@
 #else
 #if (RCAR_LSI == RCAR_H3)
 static const uint32_t prr_product = PRR_PRODUCT_H3;
-#elif(RCAR_LSI == RCAR_M3)
+#elif(RCAR_LSI == RCAR_M3 || RCAR_LSI == RZ_G2M)
 static const uint32_t prr_product = PRR_PRODUCT_M3;
 #elif(RCAR_LSI == RCAR_M3N)
 static const uint32_t prr_product = PRR_PRODUCT_M3N;