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/drivers/Makefile b/drivers/Makefile
index 7225561..e4700b3 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -57,7 +57,7 @@
 obj-$(CONFIG_SPL_USB_GADGET) += usb/gadget/
 obj-$(CONFIG_SPL_USB_GADGET) += usb/common/
 obj-$(CONFIG_SPL_USB_GADGET) += usb/gadget/udc/
-obj-$(CONFIG_SPL_WATCHDOG_SUPPORT) += watchdog/
+obj-$(CONFIG_SPL_WATCHDOG) += watchdog/
 obj-$(CONFIG_SPL_USB_HOST_SUPPORT) += usb/host/
 obj-$(CONFIG_OMAP_USB_PHY) += usb/phy/
 obj-$(CONFIG_SPL_SATA_SUPPORT) += ata/ scsi/