panfrost: Remove old comment on broken depth reload

Depth reload works now, so now the optimisation is just for
performance and isn't a workaround any more.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6609>
diff --git a/src/gallium/drivers/panfrost/pan_resource.c b/src/gallium/drivers/panfrost/pan_resource.c
index 046a452..cb2e30c 100644
--- a/src/gallium/drivers/panfrost/pan_resource.c
+++ b/src/gallium/drivers/panfrost/pan_resource.c
@@ -840,8 +840,7 @@
 
                 /* When a resource to be modified is already being used by a
                  * pending batch, it is often faster to copy the whole BO than
-                 * to flush and split the frame in two. This also mostly
-                 * mitigates broken depth reload.
+                 * to flush and split the frame in two.
                  */
 
                 panfrost_flush_batches_accessing_bo(ctx, bo, false);