add xxhdpi information to tablet checklist
add xxhdpi information to tablet checklist

Change-Id: I8eff162527a9de59c667a7152b70eed7590ddbe3

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base