[][kernel][misc][IPv4/IPv6 multicast]

[Description]
Fix omcproxy segmentation fault, backport solution form github pull-request.
Default enable bridge igmp_snooping feature (Multicast-to-Unicast)

[Release-log]
N/A

Change-Id: If714087acffb0e2dc1e7ba66124f2bb0400e2d90
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7939719
8 files changed