provide overrides for hwui memory limits for xxhdpi phones

Change-Id: I8b369619cd07530d0468a5449da30f338c13c7d2
Merge remote-tracking branch 'cyan/cm-10.1' into cm-10.1
Merge remote-tracking branch 'cm-10.1-mb52x/cm-10.1' into cm-10.1-mb52x