Kconfig: Migrate BOARD_LATE_INIT to a select

This option should not really be user selectable.  Note that on PowerPC
we currently only need BOARD_LATE_INIT when CHAIN_OF_TRUST is enabled so be
conditional on that.

Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com> (for UniPhier)
diff --git a/arch/arm/cpu/armv7/mx5/Kconfig b/arch/arm/cpu/armv7/mx5/Kconfig
index 5fb5513..7b55747 100644
--- a/arch/arm/cpu/armv7/mx5/Kconfig
+++ b/arch/arm/cpu/armv7/mx5/Kconfig
@@ -20,6 +20,7 @@
 
 config TARGET_MX53CX9020
 	bool "Support CX9020"
+	select BOARD_LATE_INIT
 	select CPU_V7
 	select MX53
 	select DM