btrfs: scrub: introduce dedicated helper to scrub simple-mirror based range

The new helper, scrub_simple_mirror(), will scrub all extents inside a
range which only has simple mirror based duplication.

This covers every range of SINGLE/DUP/RAID1/RAID1C*, and inside each
data stripe for RAID0/RAID10.

Currently we will use this function to scrub SINGLE/DUP/RAID1/RAID1C*
profiles.  As one can see, the new entrance for those simple-mirror
based profiles can be small enough (with comments, just reach 100
lines).

This function will be the basis for the incoming scrub refactor.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>