mx31/mx35/mx51/mx53/mx6: add watchdog

Use a common watchdog driver for all these cpus.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/include/configs/qong.h b/include/configs/qong.h
index d9bf201..685c618 100644
--- a/include/configs/qong.h
+++ b/include/configs/qong.h
@@ -52,6 +52,7 @@
 
 #define CONFIG_MXC_GPIO
 #define CONFIG_HW_WATCHDOG
+#define CONFIG_IMX_WATCHDOG
 
 #define CONFIG_MXC_SPI
 #define CONFIG_DEFAULT_SPI_BUS	1