armv8: ls2085qds: Add support of X-QSGMII-16PORT riser card

The X-QSGMII-16PORT is a 4xQSGMII/8xSGMII riser card with eighth SerDes
interfaces implemented in PCIe form factor board.
It supports followings
 - Card can operate with up to 4 QSGMII lane simultaneously
 - Card can operate with up to 8 SGMII lane simultaneously

Add support of X-QSGMII-16PORT riser card.
This patch also take care of back-ward compatiblity with old SGMII rise cards
used on LS2085QDS Platform.

Signed-off-by: King Chung Lo@freescale.com <KingChungLo@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>