panfrost: Correctly calculate tiled stride

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Fixes: bde19c0e7ba ("panfrost: Fix tiled texture "stride"s on Bifrost")
Tested-by: Christian Hewitt <christianshewitt@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5474>
1 file changed