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

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19298>
(cherry picked from commit 5eaca461a7)

.pick_status.json

@@ -1228,7 +1228,7 @@
         "description": "freedreno/fdl: Increase alignment for UBWC images",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null
     },

src/freedreno/fdl/fd6_layout.c

@@ -83,11 +83,13 @@ fdl6_tile_alignment(struct fdl_layout *layout, uint32_t *heightalign)
       layout->pitchalign = 2;
    }
 
-   /* note: this base_align is *probably* not always right,
-    * it doesn't really get tested. for example with UBWC we might
-    * want 4k alignment, since we align UBWC levels to 4k
+   /* Empirical evidence suggests that images with UBWC could have much
+    * looser alignment requirements, however the validity of alignment is
+    * heavily undertested and the "officially" supported alignment is 4096b.
     */
-   if (layout->cpp == 1)
+   if (layout->ubwc)
+      layout->base_align = 4096;
+   else if (layout->cpp == 1)
       layout->base_align = 64;
    else if (layout->cpp == 2)
       layout->base_align = 128;