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/Makefile b/drivers/watchdog/Makefile
index 5520d3d..7b39adc 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -22,6 +22,7 @@
 obj-$(CONFIG_WDT_ARMADA_37XX) += armada-37xx-wdt.o
 obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o
 obj-$(CONFIG_WDT_AST2600) += ast2600_wdt.o
+obj-$(CONFIG_WDT_ATCWDT200) += atcwdt200_wdt.o
 obj-$(CONFIG_WDT_BCM2835) += bcm2835_wdt.o
 obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o
 obj-$(CONFIG_WDT_BOOKE) += booke_wdt.o