spi: add bindings for microchip mpfs spi
Add device tree bindings for the {q,}spi controller on the Microchip PolarFire SoC. Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20220117110755.3433142-7-conor.dooley@microchip.com Signed-off-by: Mark Brown <broonie@kernel.org>