Convert CONFIG_SPL_SERIAL_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-rockchip/rk3036/Kconfig b/arch/arm/mach-rockchip/rk3036/Kconfig
index 0804714..9263608 100644
--- a/arch/arm/mach-rockchip/rk3036/Kconfig
+++ b/arch/arm/mach-rockchip/rk3036/Kconfig
@@ -12,6 +12,9 @@
 config SYS_MALLOC_F_LEN
 	default 0x400
 
+config SPL_SERIAL_SUPPORT
+	default y
+
 source "board/rockchip/evb_rk3036/Kconfig"
 source "board/rockchip/kylin_rk3036/Kconfig"