Revert "Omni bringup pt2"

This reverts commit 178bed054bdbc03d6573017d9452ec9f04d4d994.
marvel: build OmniTorch

Signed-off-by: olivieer <y.karasangabo@bg-rams.ac.at>
overlay: cleanup

Not needed in OmniROM

Signed-off-by: olivieer <y.karasangabo@bg-rams.ac.at>
marvel: add OmniTorch overlay

Signed-off-by: olivieer <y.karasangabo@bg-rams.ac.at>