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/tqma6s_mba6_mmc_defconfig b/configs/tqma6s_mba6_mmc_defconfig
index 7b46177..cff6e10 100644
--- a/configs/tqma6s_mba6_mmc_defconfig
+++ b/configs/tqma6s_mba6_mmc_defconfig
@@ -7,6 +7,7 @@
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_BOOTDELAY=3
 CONFIG_DEFAULT_FDT_FILE="imx6dl-mba6x.dtb"
+CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set