xfs: remove unused trace event xfs_dqreclaim_dirty

xfs: remove unused trace event xfs_dqreclaim_dirty

The tracepoint trace_xfs_dqreclaim_dirty was removed with other code
removed from xfs_qm_dquot_isolate() but the defined tracepoint was not.

Fixes: d62016b1a2df ("xfs: avoid dquot buffer pin deadlock")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>