Merge branch 'net-fsl-fman-address-erratum-A011043'

Madalin Bucur says:

====================
net: fsl/fman: address erratum A011043

This addresses a HW erratum on some QorIQ DPAA devices.

MDIO reads to internal PCS registers may result in having
the MDIO_CFG[MDIO_RD_ER] bit set, even when there is no
error and read data (MDIO_DATA[MDIO_DATA]) is correct.
Software may get false read error when reading internal
PCS registers through MDIO. As a workaround, all internal
MDIO accesses should ignore the MDIO_CFG[MDIO_RD_ER] bit.
When the issue was present, one could see such errors
during boot:

  mdio_bus ffe4e5000: Error while reading PHY0 reg at 3.3
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Signed-off-by: David S. Miller <davem@davemloft.net>