fix: eth: fixed index of the Ethernet interface

- Updated the index of the Ethernet interfaces to by port number
- Issue fount in Armada-39x SoC, when using specific configuration with
  skipping on one of network interfaces (enable egiga0, egiga2 only)
- The issue found when MAC address of network interface is incorrect, e.g.
  egiga2 uses MAC address of egiga1
- This patch set the index of the Ethernet device by the port number

Change-Id: I7f5919cfbedccf1d5edb5acc1ccafd270307ac0b
Signed-off-by: Hanna Hawa <hannah@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/23554
Tested-by: Star_Automation <star@marvell.com>
Reviewed-by: Omri Itach <omrii@marvell.com>
4 files changed