remove obsolete comments

Change-Id: I3d3106601247ba8127799143e58d6a02a106fa52
switch to ext4

Change-Id: I33543afa1a98dc0b7076e7924b11b4b0d0753086
Merge tag 'android-4.4_r1' into kitkat-staging

Android 4.4 Release 1.0