cc49894e34
Unused since 1eca809680 ("ci/v3dv: test v3dv in arm64
environment"), and in the meantime other code paths have been added and
do not support this (`.gitlab-ci/common/init-stage2.sh` when starting
xorg & wayland for instance), so instead of fixing dead code, let's
remove it.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29201>