btrfs: rename btrfs_insert_file_extent() to btrfs_insert_hole_extent()

btrfs_insert_file_extent() is only ever used to insert holes, so rename
it and remove the redundant parameters.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>