Adrián Larumbe a68c584d70 mesa: gallium: make GL object maximum label length a pipescreen cap
Commit a4ffd2395f ("mesa: Implement label sharing from GL objects with
UM drivers") enabled GL clients to tag objects at a UM driver level. In
the case of Panfrost, and for both KMDs, maximum label size is set to
4096, but the Mesa limit is much lower.

Since glObjectLabel() allocates object labels dynamically, there's no
need to have this value chiseled in stone, so allow Gallium driver
implementers to set their own limit through a pipe screen capability.

Keep the same default maximum label length as before.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Eric R. Smith <eric.smith@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38027>
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================


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