Change LockIconViewController from view controller

Change from view controller so that we can set lock icon view and change
mView. Ensure that we proactively set a lock icon view in case we
haven't inflated one yet.

Bug: 295555276
Test: test to see that lock icon view can be set later than view
inflation.

Change-Id: I66128eb0a26d346ebde94a30b0e41a960cefa138