dt-bindings: phy: qcom,qmp: add IPQ8074 PCIe Gen3 PHY binding

IPQ8074 has 2 different single lane PCIe PHY-s, one Gen2 and one Gen3.
Gen2 one is already supported, document the bindings for the Gen3 one.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220621195512.1760362-2-robimarko@gmail.com


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