Another try at camera
- reintroduce cammera wrapper and rename camera.msm7x27a.so -> camera.vendor.msm7x27a.so
- bring back USE_CAMERA_STUB
- bring back BOARD_USES_QCOM_LEGACY_CAM_PARAMS

Change-Id: I511f7f52c7b5bf51ccb1b3ba30a4192a1f695b99