configs: capricorn_cxg3: Enable CMD_WDT

Capricorn boards have WDT (WDT_SIEMENS_PMIC) and U-Boot is not configured
to trigger the WDT. Enable the "wdt" command to be able to stop the WDT
from the command line.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Heiko Schocher <hs@denx.de>

configs/capricorn_cxg3_defconfig

@@ -76,6 +76,7 @@ CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_READ=y
+CONFIG_CMD_WDT=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y