zink: use symbolic values instead of 0

Just make it easier to remember which parameter is accepting which type.

Signed-off-by: Corentin Noël <corentin.noel@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27682>

src/gallium/drivers/zink/zink_batch.c

@@ -178,8 +178,8 @@ zink_reset_batch_state(struct zink_context *ctx, struct zink_batch_state *bs)
       zink_fence_reference(screen, mfence, NULL);
    util_dynarray_clear(&bs->fences);
 
-   bs->unordered_write_access = 0;
-   bs->unordered_write_stages = 0;
+   bs->unordered_write_access = VK_ACCESS_NONE;
+   bs->unordered_write_stages = VK_PIPELINE_STAGE_NONE;
 
    /* only increment batch generation if previously in-use to avoid false detection of batch completion */
    if (bs->fence.submitted)
@@ -714,9 +714,10 @@ submit_queue(void *data, void *gdata, int thread_index)
          mb.sType = VK_STRUCTURE_TYPE_MEMORY_BARRIER;
          mb.pNext = NULL;
          mb.srcAccessMask = bs->unordered_write_access;
-         mb.dstAccessMask = 0;
+         mb.dstAccessMask = VK_ACCESS_NONE;
          VKSCR(CmdPipelineBarrier)(bs->reordered_cmdbuf,
-                                   bs->unordered_write_stages, 0,
+                                   bs->unordered_write_stages,
+                                   VK_PIPELINE_STAGE_NONE,
                                    0, 1, &mb, 0, NULL, 0, NULL);
       }
       VRAM_ALLOC_LOOP(result,