dt-bindings: snps, dw-apb-ssi: Add sparx5 support, plus rx-sample-delay-ns property

This has the following changes for the snps,dw-apb-ss DT bindings:

- Add "microchip,sparx5-spi" as the compatible for the Sparx5 SoC
  controller

- Add the property "rx-sample-delay-ns"

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200824203010.2033-5-lars.povlsen@microchip.com


Signed-off-by: Mark Brown <broonie@kernel.org>