dt-bindings: pinctrl: ocelot: Add Sparx5 SoC support

This adds documentation for the "compatible" value designated for Sparx5

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Link: https://lore.kernel.org/r/20200513125532.24585-8-lars.povlsen@microchip.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>