Revert "vl/dri3: use loader's dri3 init code and delete everything else"

This reverts commit 586d0c4a9b5d9779092a18a9803837082b0b2100.

Fixes: 586d0c4a9b5 ("vl/dri3: use loader's dri3 init code and delete everything else")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30415>
2 files changed