meta-evb: meta-evb-arm: Enable Second ethernet controller as Redfish HI

* Enable Virtio-net as BMC NiC (eth0)
* Enable SMSC_91C111 as Redfish HI network (eth0)
* Configure static IP address of virtio-net (eth0)
  and smsc_91C111 (eth1)

Using TAP Interface that allows multiple FVP instances
can reach out each other. For example, HOST (RDN2) can
reach out Redfish service (BMC) via IP address
192.168.122.3

eth0      Link encap:Ethernet  HWaddr 56:A9:AB:69:14:4E
          inet addr:192.168.122.2  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:144 errors:0 dropped:144 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7488 (7.3 KiB)  TX bytes:2050 (2.0 KiB)

eth1      Link encap:Ethernet  HWaddr 56:A9:AB:69:14:4E
          inet addr:192.168.122.3  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:144 errors:0 dropped:144 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7488 (7.3 KiB)  TX bytes:2050 (2.0 KiB)

Signed-off-by: John Chung <john.chung@arm.com>
Change-Id: I13e4003026d1b145971dd6781df97f2fe2d70b85