Convert CONFIG_SPL_GPIO_SUPPORT to Kconfig

Move this option to Kconfig and tidy up existing uses.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/armv7/am33xx/Kconfig b/arch/arm/cpu/armv7/am33xx/Kconfig
index efbc219..54474c2 100644
--- a/arch/arm/cpu/armv7/am33xx/Kconfig
+++ b/arch/arm/cpu/armv7/am33xx/Kconfig
@@ -3,6 +3,9 @@
 config SPL_EXT_SUPPORT
 	default y
 
+config SPL_GPIO_SUPPORT
+	default y
+
 config TARGET_AM43XX_EVM
 	bool "Support am43xx_evm"
 	select TI_I2C_BOARD_DETECT
diff --git a/arch/arm/cpu/armv7/omap3/Kconfig b/arch/arm/cpu/armv7/omap3/Kconfig
index de65ac6..e1c981e 100644
--- a/arch/arm/cpu/armv7/omap3/Kconfig
+++ b/arch/arm/cpu/armv7/omap3/Kconfig
@@ -6,6 +6,9 @@
 config SPL_FAT_SUPPORT
 	default y
 
+config SPL_GPIO_SUPPORT
+	default y
+
 choice
 	prompt "OMAP3 board select"
 	optional
diff --git a/arch/arm/cpu/armv7/omap4/Kconfig b/arch/arm/cpu/armv7/omap4/Kconfig
index 92eb2f4..48ce9d3 100644
--- a/arch/arm/cpu/armv7/omap4/Kconfig
+++ b/arch/arm/cpu/armv7/omap4/Kconfig
@@ -6,6 +6,9 @@
 config SPL_FAT_SUPPORT
 	default y
 
+config SPL_GPIO_SUPPORT
+	default y
+
 choice
 	prompt "OMAP4 board select"
 	optional
diff --git a/arch/arm/cpu/armv7/omap5/Kconfig b/arch/arm/cpu/armv7/omap5/Kconfig
index e367828..5b049ad 100644
--- a/arch/arm/cpu/armv7/omap5/Kconfig
+++ b/arch/arm/cpu/armv7/omap5/Kconfig
@@ -6,6 +6,9 @@
 config SPL_FAT_SUPPORT
 	default y
 
+config SPL_GPIO_SUPPORT
+	default y
+
 choice
 	prompt "OMAP5 board select"
 	optional
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index c25fcf3..d4a5bc9 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -61,6 +61,9 @@
 
 if ARCH_EXYNOS5
 
+config SPL_GPIO_SUPPORT
+	default y
+
 choice
 	prompt "EXYNOS5 board select"
 
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 1eaf406..6b1cedf 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -1,5 +1,8 @@
 if TEGRA
 
+config SPL_GPIO_SUPPORT
+	default y
+
 config TEGRA_IVC
 	bool "Tegra IVC protocol"
 	help