sunxi: enable automatic FIT build for 64-bit SoCs

The Allwinner SoCs with 64-bit cores use an ARM Trusted Firmware binary,
which needs to be loaded alongside U-Boot proper.
Set the respective Kconfig options to let them select this feature and
also automatically build the FIT image.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
[Rename Kconfig path to arch/arm/mach-sunxi/Kconfig]
Signed-off-by: Jagan Teki <jagan@openedev.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/Kconfig b/Kconfig
index 335392f..8e773b8 100644
--- a/Kconfig
+++ b/Kconfig
@@ -252,6 +252,7 @@
 config SPL_FIT_GENERATOR
 	string ".its file generator script for U-Boot FIT image"
 	depends on SPL_FIT
+	default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 	help
 	  Specifies a (platform specific) script file to generate the FIT
 	  source file used to build the U-Boot FIT image file. This gets