drivers: watchdog: add andes atcwdt200 support

This patch adds an implementation of the Andes watchdog ATCWDT200 driver.

Signed-off-by: CL Wang <cl634@andestech.com>
Signed-off-by: Randolph <randolph@andestech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 5697261..8318fd7 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -130,6 +130,12 @@
 	  Select this to enable Microchip watchdog timer, which can be found on
 	  some AT91 devices.
 
+config WDT_ATCWDT200
+	bool "Andes watchdog timer support"
+	depends on WDT
+	help
+	  Select this to enable Andes ATCWDT200 watchdog timer
+
 config WDT_BCM6345
 	bool "BCM6345 watchdog timer support"
 	depends on WDT && (ARCH_BMIPS || BCM6856 || \