Upstream has support for Intel Xe graphics in all of kernel, libdrm and
mesa, yet all of these packages are built with Intel support disabled on
aarch64.
Intel Xe drivers, unlike i915 are architecture independent.
On x86_64, they conflict with i915 drivers, so an elaborate scheme is
used to allow both drivers to coexist.
On aarch64, Intel Xe has no legacy counterpart, so no conflict either.
All the more reason to enable Intel Xe on aarch64, just like on x86_64.
Intel Xe support may not be perfect on aarch64, but this is just as true
on x86_64.