dt-bindings: phy: qcom,qmp: Add binding for SDX55 PCIe PHY

Add devicetree binding for PCIe PHY found in Qcom SDX55 platform.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210427065400.18958-2-manivannan.sadhasivam@linaro.org


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