Convert CONFIG_BOARD_EARLY_INIT_F to Kconfig

This converts the following to Kconfig:
   CONFIG_BOARD_EARLY_INIT_F

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/woodburn_defconfig b/configs/woodburn_defconfig
index aa5d587..ed4250d 100644
--- a/configs/woodburn_defconfig
+++ b/configs/woodburn_defconfig
@@ -2,6 +2,7 @@
 CONFIG_TARGET_WOODBURN=y
 CONFIG_BOOTDELAY=3
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="woodburn U-Boot > "
 CONFIG_CMD_MMC=y