ARM: multi_v7_defconfig: Enable Broadcom Kona watchdog

In order to get rid of bcm_defconfig, enable this driver which is needed
by some Broadcom SoCs based on the Kona architecture to reboot.
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/configs/multi_v7_defconfig

@@ -458,6 +458,7 @@ CONFIG_DW_WATCHDOG=y
 CONFIG_DIGICOLOR_WATCHDOG=y
 CONFIG_BCM2835_WDT=y
 CONFIG_BCM7038_WDT=m
+CONFIG_BCM_KONA_WDT=y
 CONFIG_MFD_AS3711=y
 CONFIG_MFD_AS3722=y
 CONFIG_MFD_ATMEL_FLEXCOM=y