Camera: Fix CameraRootView layout size on tablets

Use all available space when onscreen are not sync with camera controls (tablets)

Ported from: http://review.cyanogenmod.org/#/c/52464

Change-Id: I0e6a23d49213a69d93875f370ea0177e1011acdf
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>