All gallium drivers currently set MAX_FRAME_IN_FLIGHT to either 1
or 0, which means that the drivers either throttle on the previous
render or don't throttle, the current implementation is more
complicated than necessary and can be simplified.
Signed-off-by: James Xiong <james.xiong@intel.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
a65e29ccb2