IMS-VT: Fix size and mirror image issue for preview video.

- Remove the wrong mirror image flip transformation.
- Use proper transform matrix to rotate the preview video
  so that preview image maintains original aspect ratio.
- Initialize mDeviceOrientation from the UI display
  rotation, so that preview image for calls originated
  directly in landscape mode are displayed correctly.

Change-Id: I3d23c698649f8df6e425b7b92ef50d49100134c4
CRs-Fixed: 1050214
3 files changed