Camera2: Fix crash on cameras with 6mp 16:9 resolution

Change-Id: I54c8a8245905cc7dc5e09fac6a3edf55f839f4f9
Camera2: fix camera has stopped" after long press camera key

When Long press camera key to open camera, mRootView has not
been created in photoModule.init.

mRootView must be created before using it.

CRs-Fixed: 725790

Change-Id: I70cd4ac911c79a15c52d47147414bf1fcee65b53