Convert CONFIG_BOARD_LATE_INIT to Kconfig

This converts the following to Kconfig:
   CONFIG_BOARD_LATE_INIT

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/mccmon6_nor_defconfig b/configs/mccmon6_nor_defconfig
index 2750747..9e18fb3 100644
--- a/configs/mccmon6_nor_defconfig
+++ b/configs/mccmon6_nor_defconfig
@@ -18,6 +18,7 @@
 CONFIG_SPL_LOAD_FIT=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/liebherr/mccmon6/mon6_imximage_nor.cfg"
 # CONFIG_USE_BOOTCOMMAND is not set
+CONFIG_BOARD_LATE_INIT=y
 CONFIG_BOUNCE_BUFFER=y
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_FIT_IMAGE_TINY=y