feat(plat/rcar3): add a DRAM size setting for M3N

This commit adds a DRAM size setting when building with
RCAR_DRAM_LPDDR4_MEMCONF=2 for M3N Ver.1.1 4GB DRAM.
Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: Ib7fea862ab2e0bcafaf39ec030384f0fddda9b96

plat/renesas/rcar/bl2_plat_setup.c

@@ -718,8 +718,13 @@ static void bl2_advertise_dram_size(uint32_t product)
 		break;
 
 	case PRR_PRODUCT_M3N:
+#if (RCAR_DRAM_LPDDR4_MEMCONF == 2)
+		/* 4GB(4GBx1) */
+		dram_config[1] = 0x100000000ULL;
+#elif (RCAR_DRAM_LPDDR4_MEMCONF == 1)
 		/* 2GB(1GBx2) */
 		dram_config[1] = 0x80000000ULL;
+#endif
 		break;
 
 	case PRR_PRODUCT_V3M: