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/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index 184063c..bf3be50 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -27,30 +27,36 @@
 config TARGET_MPC8313ERDB
 	bool "Support MPC8313ERDB"
 	select SUPPORT_SPL
+	select BOARD_EARLY_INIT_F
 
 config TARGET_MPC8315ERDB
 	bool "Support MPC8315ERDB"
+	select BOARD_EARLY_INIT_F
 
 config TARGET_MPC8323ERDB
 	bool "Support MPC8323ERDB"
 
 config TARGET_MPC832XEMDS
 	bool "Support MPC832XEMDS"
+	select BOARD_EARLY_INIT_F
 
 config TARGET_MPC8349EMDS
 	bool "Support MPC8349EMDS"
 	select SYS_FSL_DDR
 	select SYS_FSL_HAS_DDR2
 	select SYS_FSL_DDR_BE
+	select BOARD_EARLY_INIT_F
 
 config TARGET_MPC8349ITX
 	bool "Support MPC8349ITX"
 
 config TARGET_MPC837XEMDS
 	bool "Support MPC837XEMDS"
+	select BOARD_EARLY_INIT_F
 
 config TARGET_MPC837XERDB
 	bool "Support MPC837XERDB"
+	select BOARD_EARLY_INIT_F
 
 config TARGET_IDS8313
 	bool "Support ids8313"