btrfs: pass reloc_control to setup_relocation_extent_mapping()

All parameters passed into setup_relocation_extent_mapping() can be
derived from 'struct reloc_control', so only pass in a 'struct
reloc_control'.

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