locks: rename locks_remove_flock to locks_remove_file

locks: rename locks_remove_flock to locks_remove_file

This function currently removes leases in addition to flock locks and in
a later patch we'll have it deal with file-private locks too. Rename it
to locks_remove_file to indicate that it removes locks that are
associated with a particular struct file, and not just flock locks.

Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Change-Id: I1289cfbc02eb778532e984a29adffb02a9370cc1
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>