xfs: pass btree cursors to rmap btree tracepoints

Prepare the rmap btree tracepoints for use with realtime rmap btrees by
making them take the btree cursor object as a parameter.  This will save
us a lot of trouble later on.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>

Author: Darrick J. Wong