spirv: OpImageQueryLod requires a sampler

No idea how this fell through the cracks besides the fact that the
sampler bound at 0 almost always works and the CTS isn't amazing.  In
any case, this appears to have been broken for almost forever.

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit ca295ddb)