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/Cyrus_P5040_defconfig b/configs/Cyrus_P5040_defconfig
index aa68322..768f495 100644
--- a/configs/Cyrus_P5040_defconfig
+++ b/configs/Cyrus_P5040_defconfig
@@ -8,6 +8,7 @@
 CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SYS_TEXT_BASE=0xFFF40000"
 CONFIG_BOOTDELAY=10
 CONFIG_CONSOLE_MUX=y
+CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_GREPENV=y