The render area clamping was lost during the transition to the FB
helpers. Restore the original logic so we can benefit from
EGL_KHR_partial_update on v4, and on v5 when only one damage
rectangle is passed.
Fixes: ff3eada7eb ("panfrost: Use the generic preload and FB helpers in the gallium driver")
Reported-by: Sjoerd Simons <sjoerd.simons@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Tested-by: Sjoerd Simons <sjoerd.simons@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27215>
(cherry picked from commit f6f7715c5824922e867aa739c587eb1718db66c1)