arm: green-mango: Rework watchdog handling

Disable the Xilinx and Cadence drivers.
Enable the DA9063 driver.
Enable watchdog sysfs support.

Author: frederikaalund

arch/arm/configs/green_mango_defconfig

@@ -139,8 +139,7 @@ CONFIG_SENSORS_TMP102=y
 CONFIG_THERMAL=y
 CONFIG_CPU_THERMAL=y
 CONFIG_WATCHDOG=y
-CONFIG_XILINX_WATCHDOG=y
-CONFIG_CADENCE_WATCHDOG=y
+CONFIG_WATCHDOG_SYSFS=y
 CONFIG_REGULATOR=y
 CONFIG_MEDIA_SUPPORT=y
 CONFIG_MEDIA_CAMERA_SUPPORT=y
@@ -254,6 +253,7 @@ CONFIG_MFD_DA9063=y
 CONFIG_RTC_DRV_DA9063=y
 CONFIG_INPUT_MISC=y
 CONFIG_INPUT_DA9063_ONKEY=y
+CONFIG_DA9063_WATCHDOG=y
 
 # USB
 CONFIG_USB_ULPI_BUS=y