Backport etnaviv BO interface fixes
Taken verbatim from https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14159
Needs and is needed by Librem5/linux!621 (merged).
/cc @guido.gunther
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Taken verbatim from https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14159
Needs and is needed by Librem5/linux!621 (merged).
/cc @guido.gunther