gallium: add PIPE_CAP_RESOURCE_FROM_USER_MEMORY_COMPUTE_ONLY

With the current UAPI we only support user pointers from the compute
engines, so we need a way to express that in gallium.

v2: fix typos
v3: add allows_user_pointers helper

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Pierre Moreau <dev@pmoreau.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4580>
6 files changed