Update Poky submodule
Update Poky submodule

This updates the Poky submodule to the latest morty branch, which
reverts the file change in the previous update. This is required
due to the upstream file repo being put back to its previous
state.

Signed-off-by: Will Newton <9ae5e71ad61fb3eb3f972773b758e0d4f6c5e573@resin.io>

resin-os/resin-intel