wandboard: Convert to watchdog driver model

Commit 68dcbdd594d4 ("ARM: imx: Add weak default reset_cpu()") caused
the 'reset' command in U-Boot to not cause a board reset.

Fix it by switching to the watchdog driver model via sysreset, which
is the preferred method for implementing the watchdog reset.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
diff --git a/configs/wandboard_defconfig b/configs/wandboard_defconfig
index 168e2f0..e9deab3 100644
--- a/configs/wandboard_defconfig
+++ b/configs/wandboard_defconfig
@@ -75,6 +75,8 @@
 CONFIG_SCSI=y
 CONFIG_DM_SERIAL=y
 CONFIG_MXC_UART=y
+CONFIG_SYSRESET=y
+CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_DM_THERMAL=y
 CONFIG_USB=y
 CONFIG_VIDEO=y
@@ -88,3 +90,4 @@
 CONFIG_SPLASH_SCREEN=y
 CONFIG_SPLASH_SCREEN_ALIGN=y
 CONFIG_BMP_16BPP=y
+CONFIG_IMX_WATCHDOG=y