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/dms-ba16-1g_defconfig b/configs/dms-ba16-1g_defconfig
index 9dcb6ad..60db289 100644
--- a/configs/dms-ba16-1g_defconfig
+++ b/configs/dms-ba16-1g_defconfig
@@ -9,6 +9,7 @@
 CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
 # CONFIG_SYS_STDIO_DEREGISTER is not set
 CONFIG_DEFAULT_FDT_FILE="imx6q-dms-ba16.dtb"
+CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set