Change non-promiscuous address filtering of KSZ8851SNL Ethernet MAC

from "hash perfect" to "perfect with multi-cast address passed".  This
permits ingress of Ethernet frames with MAC 33:33.x which in turn
allows us to receive IPv6 Neighbor Solicitation messages.  Without
this change we never send Neighbor Advertisements and are effectively
unreachable over IPv6.

Author: ewpa