spi/panel: dt-bindings: drop CPHA and CPOL from common properties

The spi-cpha and spi-cpol properties are device specific and should be
accepted only if device really needs them.  Drop them from common
spi-peripheral-props.yaml schema, mention in few panel drivers which use
them and include instead in the SPI controller bindings.  The controller
bindings will provide CPHA/CPOL type validation and one place for
description.  Each device schema must list the properties if they are
applicable.

Suggested-by: Jonathan Cameron <jic23@kernel.org>
Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220722191539.90641-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

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