Device cleanup

Remove empty device stylesheets
Move nokia css rule into more generic rule in ui.css

Change-Id: I1a5b2922998f7f4ed508814d17b97ee1f0da7958
Remove blackberry stylesheet

Testing on a version 4 (Blackberry 8900) shows this has no effect
so is no longer needed

Change-Id: Iee1da2b11e4177b8e7d451f68102081152882d7c
Merge changes Iee1da2b1,I1a5b2922

* changes:
  Remove blackberry stylesheet
  Device cleanup