Convert CONFIG_SPL_LIBCOMMON_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/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index 7bee6c7..6deca5b 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -1,5 +1,8 @@
 if ARCH_UNIPHIER
 
+config SPL_LIBCOMMON_SUPPORT
+	default y
+
 config SYS_CONFIG_NAME
 	default "uniphier"