CameraNext: Update focus behavior for panoramas

Panorama was using Infinity for the focus mode all the time for
panoramas. Change to use continuous-picture in viewfinder before
the actual mosaic is started then change to fixed to lock in.
This allows indoor panoramas to not suck.

Change-Id: Ida01ca1ded1e1058d76da851cd20e5b7072e15be
(cherry picked from commit 33ece020c28796f004f28843fda28092e315c9dc)
1 file changed