bcmdhd: 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.

Signed-off-by: zwliew <zhaoweiliew@gmail.com>
mm/slub: Minor tweak for performance improvements

There won't be any costly order

Change-Id: I241ff5016c0b10f96dde406e6463064f28e66112