ARM: multi_v7_defconfig: Enable RENESAS_WDT

R-Car Gen2 and RZ/G1 platforms come with a watchdog IP, therefore enable
its driver by default. It is enabled as a module to avoid increasing
the kernel image size.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/multi_v7_defconfig

@@ -498,6 +498,7 @@ CONFIG_TEGRA_WATCHDOG=m
 CONFIG_MESON_WATCHDOG=y
 CONFIG_DW_WATCHDOG=y
 CONFIG_DIGICOLOR_WATCHDOG=y
+CONFIG_RENESAS_WDT=m
 CONFIG_BCM2835_WDT=y
 CONFIG_BCM47XX_WDT=y
 CONFIG_BCM7038_WDT=m