Currently $fdtfile is constructed from CONFIG_DEFAULT_TREE, containing
the filename. However on arm64 that file is located in an allwinner
subdirectory.
To avoid the need for users/distros symlinking the .dtb files, prepend
the vendor directory for ARM64.
This aligns Pine64 with other boards such as Raspberry Pi 3.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Jagan Teki <jagan@openedev.com>
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