arm: socfpga: Use DM watchdog timer

All SoCFPGA platforms (except Cyclone V) are now switching
to CONFIG_WDT (driver model for watchdog timer drivers)
from CONFIG_HW_WATCHDOG.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
diff --git a/configs/socfpga_agilex_defconfig b/configs/socfpga_agilex_defconfig
index ee1a665..c4db1d0 100644
--- a/configs/socfpga_agilex_defconfig
+++ b/configs/socfpga_agilex_defconfig
@@ -60,5 +60,7 @@
 CONFIG_DM_USB=y
 CONFIG_USB_DWC2=y
 CONFIG_USB_STORAGE=y
+CONFIG_DESIGNWARE_WATCHDOG=y
+CONFIG_WDT=y
 # CONFIG_SPL_USE_TINY_PRINTF is not set
 CONFIG_PANIC_HANG=y