mediatek: Moved recovery image creation to include/image-commands.mk

The recovery image is reqired for D-Link M30 as well. So I moved it to include/image-commands.mk to be able to use it for MT7622 and filogic devices.

Signed-off-by: Roland Reinl <reinlroland+github@gmail.com>
(cherry picked from commit 0e2b7e3bd674d2dd69ed8daf483cac5509cec9f0)