update be2net maintainers' email addresses

be2net maintainers' email addresses changed from avagotech.com to
broadcom.com starting today. While updating the list, I'm also adding
Somnath's name to the list.

Signed-off-by: Sathya Perla <sathya.perla@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>