nir/lower_tex: handle query lod with nir_lower_tex_packing_16 at lower_tex_packing

packing_16 with floats assumed 1 (shadow) or 4 components. But query
lod operations return 2.

Fixes the following test with v3dv:
dEQP-VK.ycbcr.query.lod.fragment.r8g8b8a8_unorm

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5863>
1 file changed