Merge branch 'lantiq-GSWIP-fixes'

Martin Blumenstingl says:

====================
lantiq: GSWIP: two more fixes

after my last patch got accepted and is now in net as commit
3e6fdeb28f4c33 ("net: dsa: lantiq_gswip: Let GSWIP automatically set
the xMII clock") [0] some more people from the OpenWrt community
(many thanks to everyone involved) helped test the GSWIP driver: [1]

It turns out that the previous fix does not work for all boards.
There's no regression, but it doesn't fix as many problems as I
thought. This is why two more fixes are needed:
- the first one solves many (four known but probably there are
  a few extra hidden ones) reported bugs with the GSWIP where no
  traffic would flow. Not all circumstances are fully understood
  but testing shows that switching away from PHY auto polling
  solves all of them
- while investigating the different problems which are addressed
  by the first patch some small issues with the existing code were
  found. These are addressed by the second patch

Changes since v1 at [0]:
- Don't configure the link parameters in gswip_phylink_mac_config
  (as we're using the "modern" way in gswip_phylink_mac_link_up).
  Thanks to Andrew for the hint with the phylink documentation.
- Clarify that GSWIP_MII_CFG_RMII_CLK is ignored by the hardware in
  the description of the second patch as suggested by Hauke
- Don't set GSWIP_MII_CFG_RGMII_IBS in the second patch as we don't
  have any hardware available for testing this. The patch
  description now also reflects this.
- Added Andrew's Reviewed-by to the first patch (thank you!)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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