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/configs/thuban_defconfig b/configs/thuban_defconfig
index cf42f46..9e12a18 100644
--- a/configs/thuban_defconfig
+++ b/configs/thuban_defconfig
@@ -9,6 +9,7 @@
CONFIG_SPL_LIBDISK_SUPPORT=y
CONFIG_SPL_MMC_SUPPORT=y
CONFIG_SPL_NAND_SUPPORT=y
+CONFIG_SPL_SERIAL_SUPPORT=y
CONFIG_DEFAULT_DEVICE_TREE="am335x-draco"
CONFIG_BOOTDELAY=3
CONFIG_SPL=y