etnaviv: blt: properly program surface TS offset for clears

We clear the wrong TS region for != level 0 surfaces or TS buffers
with a internal offset.

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7367>
1 file changed