Revert "Add modified Startek panel driver"

This reverts commit bda6c18063fcfa46c78781f63fef311253753c80.

DSI driver should be enabled in baylibre-4.19 branch, and the dts
changes should be added in overlay dts.

Revert the change so we can resubmit at baylibre-4.19 branch

Change-Id: Ia9dc94429ea09ea3344a7598b9e58b3fabf9b9be
5 files changed