[rdk-b][mt7986][wifi-hal][Add IGMP snooping function]

[Description]
Add get and set IGMP snooping functions. Set function will change the bridge set, it will make all radio follow the last set.
So, no mater which radio index is inputed, set function will apply the setting to all radios.

[Release-log]
N/A

Change-Id: I8d5a4a2f682c11ad9320f461c1a2744eb9b51091
1 file changed