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/mx53ppd_defconfig b/configs/mx53ppd_defconfig
index 2eab6f2..1dca245 100644
--- a/configs/mx53ppd_defconfig
+++ b/configs/mx53ppd_defconfig
@@ -17,6 +17,7 @@
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 CONFIG_SUPPORT_RAW_INITRD=y
 CONFIG_MISC_INIT_R=y
+CONFIG_BOARD_LATE_INIT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_DM=y