freedreno/fdl: Increase alignment for UBWC images
From empirical tests (on a660) R8G8 with UBWC enabled requires 256b alignment, otherwise there would be a GPU fault during blits.
Set alignment to 4096 for all UBWC images since that's what blob does and this area is heavily undertested.
Fixes GPU fault in Borderlands 3 running through DXVK.
cc: mesa-stable