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-omap2/am33xx/Kconfig b/arch/arm/mach-omap2/am33xx/Kconfig
index 51316b7..70377f0 100644
--- a/arch/arm/mach-omap2/am33xx/Kconfig
+++ b/arch/arm/mach-omap2/am33xx/Kconfig
@@ -41,7 +41,7 @@
 	imply SPL_ENV_SUPPORT
 	imply SPL_FS_EXT4
 	imply SPL_FS_FAT
-	imply SPL_GPIO_SUPPORT
+	imply SPL_GPIO
 	imply SPL_I2C_SUPPORT
 	imply SPL_LIBCOMMON_SUPPORT
 	imply SPL_LIBDISK_SUPPORT
@@ -225,7 +225,7 @@
 	imply SPL_ENV_SUPPORT
 	imply SPL_FS_EXT4
 	imply SPL_FS_FAT
-	imply SPL_GPIO_SUPPORT
+	imply SPL_GPIO
 	imply SPL_I2C_SUPPORT
 	imply SPL_LIBCOMMON_SUPPORT
 	imply SPL_LIBDISK_SUPPORT