Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

At the moment we are only building for a single arm64 target, so mark
this as arm64 only (we may in the future build for arm32 as well, but
we're not at the moment). Also we'll produce a single package of
binaries for all supported boards. This package is used as a build time
dependency of U-Boot rather than being installed directly on a target.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>