filter multicast packages while suspended.

in some crowded WLANs, with a lot of multicast packages circulating,
the device would not enter deep sleep.
this will allow the device to enter deep sleep.

Change-Id: I72cfefe89af64a7152e644d5095a57823ef04f4e
Merge "filter multicast packages while suspended." into cm-11.0
Merge pull request #9 from CyanogenMod/cm-11.0

Cm 11.0