Convert CONFIG_BOARD_EARLY_INIT_F et al to Kconfig

This converts the following to Kconfig:
   CONFIG_BOARD_EARLY_INIT_F
   CONFIG_BOARD_EARLY_INIT_R

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/deneb_defconfig b/configs/deneb_defconfig
index 9682cb7..31a68f8 100644
--- a/configs/deneb_defconfig
+++ b/configs/deneb_defconfig
@@ -23,6 +23,7 @@
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/siemens/capricorn/imximage.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_LOG=y
+CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_SEPARATE_BSS=y