panfrost: Use panfrost_get_layer_stride() instead of open-coding it

If we don't do that we don't account for CRC buffers.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8125>

src/gallium/drivers/panfrost/pan_resource.c

@@ -882,7 +882,8 @@ panfrost_ptr_map(struct pipe_context *pctx,
         if (drm_is_afbc(rsrc->layout.modifier)) {
                 struct panfrost_resource *staging = pan_alloc_staging(ctx, rsrc, level, box);
                 transfer->base.stride = staging->layout.slices[0].line_stride;
-                transfer->base.layer_stride = transfer->base.stride * box->height;
+                transfer->base.layer_stride =
+                        panfrost_get_layer_stride(&staging->layout, level);
 
                 transfer->staging.rsrc = &staging->base;