dt-bindings: mmc: sdhci-pxa: add pxav1

Add a compatible for the pxav1 controller in the PXA168, along with
optional pinctrl properties to use for an errata workaround.

Signed-off-by: Doug Brown <doug@schmorgal.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230116194401.20372-9-doug@schmorgal.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>