xfs: Add helper function xfs_attr_node_removename_rmt

xfs: Add helper function xfs_attr_node_removename_rmt

This patch adds another new helper function
xfs_attr_node_removename_rmt. This will also help modularize
xfs_attr_node_removename when we add delay ready attributes later.

Signed-off-by: Allison Collins <[email protected]>
Reviewed-by: Brian Foster <[email protected]>
Reviewed-by: Chandan Rajendra <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
Acked-by: Dave Chinner <[email protected]>