cpsw without dual_emac drops multicast in promisc mode

[Lennart Sorensen]

It seems that running tcpdump (and hence enabling promisc mode), causes
all multicast packets to dropped with the cpsw driver.  We are not using
the dual_emac feature, we are just using one port.  This is on the DRA7XX.

I see that in dual_emac mode, it is set to ALE_BYPASS (no idea if this
works, I haven't tried dual_emac mode).  In non dual_emac mode it uses
ALE_P0_UNI_FLOOD after flushing the multicast entries.  Maybe that's
not good enough.

-- 
Len Sorensen
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