dt-bindings: phy: Add qcom,snps-eusb2-repeater schema file

The SM8550 SoC uses Synopsis eUSB2 repeater found in PM8550b.
Add a dt-binding schema for the new driver.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230208190200.2966723-2-abel.vesa@linaro.org


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