watchdog: zx2967: add watchdog controller driver for ZTE's zx2967 family

This patch adds watchdog controller driver for ZTE's zx2967 family.

Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 21b6bf9..a2126e2 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -83,6 +83,7 @@
 obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o
 obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o
 obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
+obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o