Generate extra userdata partition if needed

* To support variants of devices which may come in 16/32/64GB variants.

Change-Id: I74c32d8316f0450a1445fe95a95e5cabb7a9dd1b
Merge tag 'android-4.4.3_r1' into HEAD

Android 4.4.3 release 1

Change-Id: Ie4ad0f5e2785df0f5083e1bc93951ce389b293e5
Merge tag 'android-4.4.3_r1.1' into HEAD

Android 4.4.3 release 1.1

Change-Id: I814a785dd9e199c1d1168fea761a20ddc897904a
Merge remote-tracking branch 'pac/pac-4.4' into pac-4.4