ARM: imx6: DHCOM i.MX6 PDK: Enable sysreset driver and wdt command

The SPL does not have DM enabled and therefor still needs to use the
hardware watchdog interface provided by the imx-watchdog driver.

Fixes: broken reset command after f2929d11a639 ("watchdog: imx: Use
       immediate reset bits for expire_now")

Signed-off-by: Claudius Heine <ch@denx.de>
diff --git a/configs/dh_imx6_defconfig b/configs/dh_imx6_defconfig
index 0a38da6..db5152d 100644
--- a/configs/dh_imx6_defconfig
+++ b/configs/dh_imx6_defconfig
@@ -40,6 +40,7 @@
 CONFIG_CMD_SATA=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_USB_MASS_STORAGE=y
+CONFIG_CMD_WDT=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_TIME=y
 CONFIG_CMD_EXT4_WRITE=y
@@ -83,6 +84,8 @@
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_MXC_SPI=y
+CONFIG_SYSRESET=y
+CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_GADGET=y