Fix visibility of camera widget on insecure lock screens with DPM

The camera widget should be visible on an insecure lockscreen even
with the KEYGUARD_DISABLE_SECURE_CAMERA policy flag set.

Change-Id: I37ff905c6325be9120b16984d3401f334ad00e4c
Merge "Fix visibility of camera widget on insecure lock screens with DPM" into cm-11.0