freedreno/a3xx: Mostly fix min-vs-mag filtering decisions on non-mipmap tex.
This is based on the fix I used for the same problem on V3D. In this
case, it fixes all but the the
dEQP-GLES2.functional.texture.filtering.2d.*_npot
cases of
dEQP-GLES2.functional.texture.filtering.2d.*
's failures.