[eoib] Add Ethernet over Infiniband (EoIB) driver

EoIB is a fairly simple protocol in which raw Ethernet frames
(excluding the CRC) are encapsulated within Infiniband Unreliable
Datagrams, with a four-byte fixed EoIB header (which conveys no actual
information).  The Ethernet broadcast domain is provided by a
multicast group, similar to the IPoIB IPv4 multicast group.

The mapping from Ethernet MAC addresses to Infiniband address vectors
is achieved by snooping incoming traffic and building a peer cache
which can then be used to map a MAC address into a port GID.  The
address vector is completed using a path record lookup, as for IPoIB.
Note that this requires every packet to include a GRH.

Add basic support for EoIB devices.  This driver is substantially
derived from the IPoIB driver.  There is currently no mechanism for
automatically creating EoIB devices.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

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