tg3: Add 57766 ASIC rev support

This patch adds support for the 57766 ASIC revision.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/broadcom/tg3.c
Simple merge

diff --cc drivers/net/ethernet/broadcom/tg3.h
Simple merge