sunxi: Select CONFIG_OF_BOARD_SETUP from arch/arm/Kconfig

Always select OF_BOARD_SETUP on sunxi, rather then having it in almost
all our defconfigs. This also fixes it missing from some recently
added defconfigs.

This commit also modifies our ft_board_setup() to not cause warnings
when CONFIG_VIDEO_DT_SIMPLEFB is not set, since we will now always
build it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e5f57ef..ab986d3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -531,6 +531,7 @@
 	select DM_KEYBOARD
 	select DM_SERIAL
 	select DM_USB
+	select OF_BOARD_SETUP
 	select OF_CONTROL
 	select OF_SEPARATE
 	select SPL_STACK_R if !MACH_SUN9I