Otherwise we might get VM_L2_PROTECTION_FAULT_STATUS errors.

Fixes: 8275dc1e ("ac/surface: fix epitch when modifying surf_pitch")
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <mesa/mesa!5841>