radeon/vcn: use st_rps_bits only when it's set
Fixes: c9baccb5
For certain player which doesn't implement st_rps_bits, or when st_rps_bits is set to 0 (e.g. it doesn't have rps explicitly defined in slice header), we don't set st_rps_bits and the related flag, since we don't skip parsing the rps structure in these cases.
Signed-off-by: Boyuan Zhang boyuan.zhang@amd.com