bcmdhd: reenable IPv6, disable multicast in suspend

Change-Id: Ibed08394600cd00bbace45d55f75d0bb1e12c537
bcmdhd: disable GAN_LITE_NAT_KEEPALIVE_FILTER

Change-Id: Ibffa4612d418a93483d3a6b374b3f87a554b57d5