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/common/spl/Kconfig b/common/spl/Kconfig
index 714c2b9..7a29b3a 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -636,7 +636,7 @@
 	  as early as possible during boot, and this option can enable that
 	  within SPL.
 
-config SPL_GPIO_SUPPORT
+config SPL_GPIO
 	bool "Support GPIO in SPL"
 	help
 	  Enable support for GPIOs (General-purpose Input/Output) in SPL.
@@ -1490,7 +1490,7 @@
 	help
 	  Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
 
-config TPL_GPIO_SUPPORT
+config TPL_GPIO
 	bool "Support GPIO in TPL"
 	help
 	  Enable support for GPIOs (General-purpose Input/Output) in TPL.