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/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 9057703..cd253b9 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -165,7 +165,7 @@
 
 config SPL_DM_REGULATOR_GPIO
 	bool "Enable Driver Model for GPIO REGULATOR in SPL"
-	depends on DM_REGULATOR_GPIO && SPL_GPIO_SUPPORT
+	depends on DM_REGULATOR_GPIO && SPL_GPIO
 	select SPL_DM_REGULATOR_COMMON
 	---help---
 	This config enables implementation of driver-model regulator uclass