PIN Lockscreen: Fix mdpi layout issues

Before: http://i.imgur.com/qmsy8Sr.png
After: http://i.imgur.com/rzHtwu4.png

Author: Michael Bestas
Lockscreen Media controls: Fix mdpi layout issues

Before: http://i.imgur.com/56jXhXG.png
After: http://i.imgur.com/wQJV3M1.png

Author: Michael Bestas
Increase media volume levels

Increase media volume levels from 15 to 30
Also update the default headset volume restore cap to reflect the change.

Author: Michael Bestas