net: designware: Add npcm8xx sgmii pcs support

The PCS exists only in GMAC1 and relates to SGMII interface and
is used to control the SGMII PHY.

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>
[trini: Adjust slightly for white space and to move 'start' to within if
        block]
2 files changed