ARM: multi_v7_defconfig: set bcm47xx watchdog

Correct the bcm47xx watchdog option.  The convention of bcm watchdogs is
the _WDT suffix.

Fixes: 8dace304 ("ARM: multi_v7_defconfig: Enable BCM47xx/BCM5301x drivers")
Signed-off-by: NValentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

arch/arm/configs/multi_v7_defconfig

@@ -471,7 +471,7 @@ CONFIG_MESON_WATCHDOG=y
 CONFIG_DW_WATCHDOG=y
 CONFIG_DIGICOLOR_WATCHDOG=y
 CONFIG_BCM2835_WDT=y
-CONFIG_BCM47XX_WATCHDOG=y
+CONFIG_BCM47XX_WDT=y
 CONFIG_BCM7038_WDT=m
 CONFIG_BCM_KONA_WDT=y
 CONFIG_MFD_ACT8945A=y