btrfs: sink gfp_t parameter to btrfs_qgroup_trace_extent

All callers pass GFP_NOFS, we can drop the parameter and use it
directly.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>