Add dependency to mobile module

The mobile module should be loaded to ensure the device is known
beforehand. Currently CentralNotice module runs before this gets loaded
so will always pass 'desktop' as the device type.

Change-Id: I1f3ef13ba362ebdd81f5d64d3bfaf8da4de8b054
Remove unnecessary global

Not used anywhere

Change-Id: I075a516441ea51126b84007fb4496b4726f063d4