dt-bindings: phy: qcom,qmp-pcie: document the SM8350 two lanes PCIe PHY

Document the two lanes PCIe PHY found on SM8350 SoCs along the
already documented single lane PCIe PHY.

This fixes:
/soc@0/phy@1c0e000: failed to match any schema with compatible: ['qcom,sm8350-qmp-gen3x2-pcie-phy']

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241204-topic-misc-sm8350-pcie-bindings-fix-v1-1-e8eaff1699d7@linaro.org


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