v3d: support for textureQueryLOD

v3d: support for textureQueryLOD

Fixes all the ARB_texture_query_lod piglit tests, and needed to get
the Vulkan CTS textureQueryLOD passing with the ongoing Vulkan driver.

Note that LOD Query bit flag became only available on V42 of the hw,
but the v3d40_tex is using V41 as reference. In order to avoid setting
up the infrastructure to support both v41 and v42, we manually set the
bit if the device version is the correct one.

We also fix how the ARB_texture_query_lod (so EXT_texture_query_lod)
is exposed. Before this commit it was always exposed (wrongly as it
was not really supported). Now it is exposed for devinfo.ver >= 42.

v2: move _need_sampler helper to nir.h (Eric Anholt)

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4677>