Rename SPL_WATCHDOG_SUPPORT to SPL_WATCHDOG

Rename this option so that CONFIG_IS_ENABLED can be used with it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/ls1046a_common.h b/include/configs/ls1046a_common.h
index 11e1a18..4618244 100644
--- a/include/configs/ls1046a_common.h
+++ b/include/configs/ls1046a_common.h
@@ -106,7 +106,7 @@
 #define CONFIG_SPL_LIBCOMMON_SUPPORT
 #define CONFIG_SPL_LIBGENERIC_SUPPORT
 #define CONFIG_SPL_ENV_SUPPORT
-#define CONFIG_SPL_WATCHDOG_SUPPORT
+#define CONFIG_SPL_WATCHDOG
 #define CONFIG_SPL_I2C_SUPPORT
 #define CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT