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/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index 0e59931..c25ee43 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -17,7 +17,7 @@
 	select SPL_DM_RESET
 	select SPL_SERIAL_SUPPORT
 	select SPL_SYSCON
-	select SPL_WATCHDOG_SUPPORT if WATCHDOG
+	select SPL_WATCHDOG if WATCHDOG
 	imply BOOTSTAGE_STASH if SPL_BOOTSTAGE
 	imply SPL_BOOTSTAGE if BOOTSTAGE
 	imply SPL_DISPLAY_PRINT