msm7x30-common: Fix camera preview

* Disable LegacyCamera, we can use normal camera now
* Remove LegacyCamera & Camera overlays
* Add compatibility flag for semc ics camera blobs

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: Idabd25477f38aaaf418ca83e56fdc3337933b9d7