freedreno/a6xx: add missing USES_GMEM flag and BIN_RENDER_END markers
This fixes L2 preemption not saving/restoring GMEM (note L2 is preempt anywhere with triangle granularity).
These changes aren't tested with L1 preemption.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
This fixes L2 preemption not saving/restoring GMEM (note L2 is preempt anywhere with triangle granularity).
These changes aren't tested with L1 preemption.