kconfig: add CONFIG_SUPPORT_SPL

CONFIG_SPL should not be enabled for boards that do not have SPL.
CONFIG_SUPPORT_SPL introduced by this commit should be "select"ed
by boards with SPL support and CONFIG_SPL should depend on it.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/armv7/exynos/Kconfig b/arch/arm/cpu/armv7/exynos/Kconfig
index 7a0d182..b895223 100644
--- a/arch/arm/cpu/armv7/exynos/Kconfig
+++ b/arch/arm/cpu/armv7/exynos/Kconfig
@@ -4,6 +4,7 @@
 	prompt "EXYNOS board select"
 
 config TARGET_SMDKV310
+	select SUPPORT_SPL
 	bool "Exynos4210 SMDKV310 board"
 	select OF_CONTROL if !SPL_BUILD
 
@@ -15,6 +16,7 @@
 
 config TARGET_ORIGEN
 	bool "Exynos4412 Origen board"
+	select SUPPORT_SPL
 
 config TARGET_TRATS2
 	bool "Exynos4412 Trat2 board"
@@ -24,22 +26,27 @@
 
 config TARGET_ARNDALE
 	bool "Exynos5250 Arndale board"
+	select SUPPORT_SPL
 	select OF_CONTROL if !SPL_BUILD
 
 config TARGET_SMDK5250
 	bool "SMDK5250 board"
+	select SUPPORT_SPL
 	select OF_CONTROL if !SPL_BUILD
 
 config TARGET_SNOW
 	bool "Snow board"
+	select SUPPORT_SPL
 	select OF_CONTROL if !SPL_BUILD
 
 config TARGET_SMDK5420
 	bool "SMDK5420 board"
+	select SUPPORT_SPL
 	select OF_CONTROL if !SPL_BUILD
 
 config TARGET_PEACH_PIT
 	bool "Peach Pi board"
+	select SUPPORT_SPL
 	select OF_CONTROL if !SPL_BUILD
 
 endchoice