Camera: fix crash on screen off-on on preview screen

Some Camera HALs don't like stopPreview being called with
setPreviewTexture set to null.

Problem occurs on:
 - Acer A700 (Tegra 3) - always
 - Samsung I9082 (Broadcom) - sometimes

Change-Id: Ifd5375d69ef9851a058d2385bf2ee9c89e85bae0
camera2: update to new 4.4 KitKat UI

thanks kroz

Change-Id: Ibac9681e53660bb727c2419f06b5b5509ebe169c
White panorama ui

white progress indicator
white recording shutter button

Change-Id: I8c2eddc6059ae19a2c98cf928b51bab4c05c9232
camera2: follow new 4.4 UI guidelines

powershot button was still ICS blue...changed to white

Change-Id: Ic4c813de047a5bd84ed1bb3b124fa2b7d0ca064d