VendorCM : Add density bucket for xhdpi

Add missing density buckets for devices such
as the nexus 5.

Change-Id: If759e5f061fe7f199db0688889db9559538dad84
VendorCM : Add default wallpaper density bucket for hdpi

Change-Id: Ia49dc5a6ee52458347ee2b4e1b3cb7b562ab6a8c
Merge remote-tracking branch 'CyanogenMod/cm-11.0' into cm-11.0