ARM: configs: at91: enable sama5d4 compatible watchdog

Enable CONFIG_SAMA5D4_WATCHDOG. This driver is compatible with sam9x60
watchdog timer block.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Link: https://lore.kernel.org/r/1581408369-14469-3-git-send-email-eugen.hristev@microchip.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/configs/at91_dt_defconfig

@@ -118,6 +118,7 @@ CONFIG_POWER_SUPPLY=y
 # CONFIG_HWMON is not set
 CONFIG_WATCHDOG=y
 CONFIG_AT91SAM9X_WATCHDOG=y
+CONFIG_SAMA5D4_WATCHDOG=y
 CONFIG_MFD_ATMEL_FLEXCOM=y
 CONFIG_MFD_ATMEL_HLCDC=y
 CONFIG_REGULATOR=y