Merge branch 'dt-bindings-net-dsa-microchip-convert-ksz-bindings-to-yaml'

Christian Eggers says:

====================
dt-bindings: net: dsa: microchip: convert KSZ bindings to yaml

These patches are orginally from the series

"net: dsa: microchip: PTP support for KSZ956x"

As the the device tree conversion to yaml is not really related to the
PTP patches and the original series is going to take more time than
I expected, I would like to split this.

Changes (original series -> v1)
--------------------------------
- dts: moved "allOf" below "maintainers"
- dts: use "unevaluatedProperties" instead of "additionalProperties"
- dts: removed "spi-cpha" and "spi-cpol" flags as the hardware is fixed
- ksz8795: setup SPI for mode 3
- ksz9477: dito
====================

Link: https://lore.kernel.org/r/20201120112107.16334-1-ceggers@arri.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>