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/stm32h743-eval_defconfig b/configs/stm32h743-eval_defconfig
index 432fce0..6fd8cd8 100644
--- a/configs/stm32h743-eval_defconfig
+++ b/configs/stm32h743-eval_defconfig
@@ -10,6 +10,7 @@
 CONFIG_BOOTDELAY=3
 # CONFIG_USE_BOOTCOMMAND is not set
 CONFIG_DEFAULT_FDT_FILE="stm32h743i-eval"
+CONFIG_BOARD_LATE_INIT=y
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SYS_PROMPT="U-Boot > "