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/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index c0bb67b..39d0ab0 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -15,15 +15,19 @@
 
 config TARGET_B4860QDS
 	bool "Support B4860QDS"
+	select SUPPORT_SPL
 
 config TARGET_BSC9131RDB
 	bool "Support BSC9131RDB"
+	select SUPPORT_SPL
 
 config TARGET_BSC9132QDS
 	bool "Support BSC9132QDS"
+	select SUPPORT_SPL
 
 config TARGET_C29XPCIE
 	bool "Support C29XPCIE"
+	select SUPPORT_SPL
 
 config TARGET_P3041DS
 	bool "Support P3041DS"
@@ -69,18 +73,22 @@
 
 config TARGET_P1010RDB
 	bool "Support P1010RDB"
+	select SUPPORT_SPL
 
 config TARGET_P1022DS
 	bool "Support P1022DS"
+	select SUPPORT_SPL
 
 config TARGET_P1023RDB
 	bool "Support P1023RDB"
 
 config TARGET_P1_P2_RDB
 	bool "Support P1_P2_RDB"
+	select SUPPORT_SPL
 
 config TARGET_P1_P2_RDB_PC
 	bool "Support p1_p2_rdb_pc"
+	select SUPPORT_SPL
 
 config TARGET_P1_TWR
 	bool "Support p1_twr"
@@ -102,18 +110,22 @@
 
 config TARGET_T104XRDB
 	bool "Support T104xRDB"
+	select SUPPORT_SPL
 
 config TARGET_T208XQDS
 	bool "Support T208xQDS"
+	select SUPPORT_SPL
 
 config TARGET_T208XRDB
 	bool "Support T208xRDB"
+	select SUPPORT_SPL
 
 config TARGET_T4240EMU
 	bool "Support T4240EMU"
 
 config TARGET_T4240QDS
 	bool "Support T4240QDS"
+	select SUPPORT_SPL
 
 config TARGET_T4240RDB
 	bool "Support T4240RDB"