drivers: renesas: rom: Move to common

Move rom driver code to common directory, so that the same
code can be re-used by both R-Car Gen3 and RZ/G2 platforms.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Change-Id: I399dfb5eff186db76d26fa9c54bea88bee66789c
diff --git a/plat/renesas/common/common.mk b/plat/renesas/common/common.mk
index dda7c89..09ff1d5 100644
--- a/plat/renesas/common/common.mk
+++ b/plat/renesas/common/common.mk
@@ -91,6 +91,7 @@
 			drivers/renesas/common/emmc/emmc_init.c		\
 			drivers/renesas/common/emmc/emmc_read.c		\
 			drivers/renesas/common/emmc/emmc_cmd.c		\
+			drivers/renesas/common/rom/rom_api.c		\
 			drivers/io/io_storage.c
 
 BL31_SOURCES	+=	${RCAR_GIC_SOURCES}				\