ARM: multi_v7_defconfig: enable DW_WATCHDOG

The watchdog timer on the SoCFPGA platform is the Synopsys Designware watchdog.
Enable CONFIG_DW_WATCHDOG for the driver to get built.
Signed-off-by: NDinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/configs/multi_v7_defconfig

@@ -426,6 +426,7 @@ CONFIG_SUNXI_WATCHDOG=y
 CONFIG_IMX2_WDT=y
 CONFIG_TEGRA_WATCHDOG=m
 CONFIG_MESON_WATCHDOG=y
+CONFIG_DW_WATCHDOG=y
 CONFIG_DIGICOLOR_WATCHDOG=y
 CONFIG_MFD_AS3711=y
 CONFIG_MFD_AS3722=y