stm32mp1: configs: add condition to activate WATCHDOG in SPL

Only activate WATCHDOG in SPL when CONFIG_WATCHDOG is activated in U-Boot.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index cee3ce1..187be17 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
+	select SPL_WATCHDOG_SUPPORT if WATCHDOG
 	imply BOOTSTAGE_STASH if SPL_BOOTSTAGE
 	imply SPL_BOOTSTAGE if BOOTSTAGE
 	imply SPL_DISPLAY_PRINT