configs: m68k: add watchdog driver

Add config options for mcf_wdt driver.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
Changes for v2:
- none
Changes for v3:
- none
diff --git a/configs/M5208EVBE_defconfig b/configs/M5208EVBE_defconfig
index 0c5afe8..aa054f7 100644
--- a/configs/M5208EVBE_defconfig
+++ b/configs/M5208EVBE_defconfig
@@ -50,3 +50,5 @@
 CONFIG_MII=y
 CONFIG_MCFUART=y
 CONFIG_WATCHDOG_TIMEOUT_MSECS=5000
+CONFIG_WDT=y
+CONFIG_WDT_MCF=y