btrfs: move dev-replace prototypes into dev-replace.h

We already have a dev-replace.h, simply move these prototypes and
helpers into dev-replace.h where they belong.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>