net: phy: micrel_ksz90x1: support forced GIGE master for KSZ9031

The micrel KSZ9031 phy has a optional clock pin (CLK125_NDO) which can be
used as reference clock for the MAC unit. The clock signal must meet the
RGMII requirements to ensure the correct data transmission between the
MAC and the PHY. The KSZ9031 phy does not fulfill the duty cycle
requirement if the phy is configured as slave. For a complete
describtion look at the errata sheets: DS80000691D or DS80000692D.

The errata sheet recommends to force the phy into master mode whenever
there is a 1000Base-T link-up as work around. Only set the
"micrel,force-master" property if you use the phy reference clock provided
by CLK125_NDO pin as MAC reference clock in your application.

Attention: this workaround is only usable if the link partner can
be configured to slave mode for 1000Base-T.

This follows linux implementation in commit
e1b505a60366 ("net: phy: micrel: add 125MHz reference clock workaround")

Signed-off-by: Markus Niebel <[email protected]>
Signed-off-by: Max Merchel <[email protected]>

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