dt-bindings: phy-j721e-wiz: add j721s2 compatible string

Add ti,j721s2-wiz-10g compatible string to binding documentation.

Signed-off-by: Matt Ranostay <mranostay@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221123032413.1193961-2-mranostay@ti.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>