Setup common tuna extract-files/remove Google self-extractors

Since tuna devices are no longer maintained by AOSP there is
no need to have multiple locations and duplicate files. This
Will put all common files in vendor/samsung/tuna and device
specific ones in vendor/samsung/maguro.

Change-Id: Ib36dc6e09bd598db7b8c0f3c154b252ebfe4e2ea