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/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index 00dd3c1..bfa63e4 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -33,12 +33,14 @@
 	bool "Support BSC9131RDB"
 	select ARCH_BSC9131
 	select SUPPORT_SPL
+	select BOARD_EARLY_INIT_F
 
 config TARGET_BSC9132QDS
 	bool "Support BSC9132QDS"
 	select ARCH_BSC9132
 	select BOARD_LATE_INIT if CHAIN_OF_TRUST
 	select SUPPORT_SPL
+	select BOARD_EARLY_INIT_F
 
 config TARGET_C29XPCIE
 	bool "Support C29XPCIE"