bcmdhd: reenable IPv6, disable multicast in suspend

Change-Id: I071c935608e23d538a4e2c2c3bd72c52b4e3e749
bcmdhd: disable GAN_LITE_NAT_KEEPALIVE_FILTER

Change-Id: I26c219ed97885de200360d5979c74ae4ccf0e8d0