p500: Enable KitKat style zRam

http://source.android.com/devices/low-ram.html#zram

Change-Id: I624d425e483ea26797ccacc56489c9e3c96f3f11
Fix VPN permissions

Already defined in:
https://github.com/androidarmv6/android_system_core/blob/cm-11.0/rootdir/ueventd.rc

Change-Id: I5077387244d1777cec657274d3c4555b65e0602e