Send an message to decouple the gcam module change.

In this particular case, we try to enter GCam module directly which cause the
mCameraDevice to become null for photo module.
Therefore we post a message to switch into GCam to make sure current mode
switch complete first.

bug:11252237

Change-Id: Ibd33815e7bee74425faa758247e1dec85a2f17cb
1 file changed