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/hsdk_4xd_defconfig b/configs/hsdk_4xd_defconfig
index 5fe6f75..a6c9177 100644
--- a/configs/hsdk_4xd_defconfig
+++ b/configs/hsdk_4xd_defconfig
@@ -10,6 +10,7 @@
 CONFIG_DEBUG_UART=y
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS0,115200n8"
+CONFIG_BOARD_LATE_INIT=y
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_HUSH_PARSER=y