net: xpcs: add SGMII MAC manual update mode

Older revisions of the XPCS IP do not support the MAC_AUTO_SW flag and
need the BMCR register updated with the speed information from the PHY.
Split the DW_XPCS_SGMII_MODE_MAC mode into _AUTO and _MANUAL variants,
where _AUTO mode means the update happens in hardware autonomously,
whereas the _MANUAL mode means that we need to update the BMCR register
when the link comes up.

This will be required for the older XPCS IP found in KSZ9477.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

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