Rename GPIO_SUPPORT to GPIO

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index c25ee43..cf39a4a 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -7,7 +7,7 @@
 	select SPL_DM_SEQ_ALIAS
 	select SPL_DRIVERS_MISC_SUPPORT
 	select SPL_FRAMEWORK
-	select SPL_GPIO_SUPPORT
+	select SPL_GPIO
 	select SPL_LIBCOMMON_SUPPORT
 	select SPL_LIBGENERIC_SUPPORT
 	select SPL_OF_CONTROL