drivers: renesas: watchdog: Move to common

Move watch 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: I235f2cde325a0feeadbfc4b7ee02e8b1186f7ea1

plat/renesas/common/common.mk

@@ -91,6 +91,7 @@ BL2_SOURCES	+=	${RCAR_GIC_SOURCES}				\
 			drivers/renesas/common/emmc/emmc_init.c		\
 			drivers/renesas/common/emmc/emmc_read.c		\
 			drivers/renesas/common/emmc/emmc_cmd.c		\
+			drivers/renesas/common/watchdog/swdt.c		\
 			drivers/renesas/common/rom/rom_api.c		\
 			drivers/io/io_storage.c
 

plat/renesas/rcar/platform.mk

@@ -324,7 +324,6 @@ BL2_SOURCES	+=	plat/renesas/rcar/aarch64/platform_common.c	\
 			drivers/renesas/rcar/rpc/rpc_driver.c		\
 			drivers/renesas/rcar/dma/dma_driver.c		\
 			drivers/renesas/rcar/avs/avs_driver.c		\
-			drivers/renesas/rcar/watchdog/swdt.c		\
 			drivers/renesas/rcar/board/board.c
 
 BL31_SOURCES	+=	plat/renesas/rcar/plat_topology.c		\