arm64: dts: qcom: sm8450-hdk: add pcie nodes

Add device tree nodes for PCIe0/PCIe1 controllers and corresponding
PHYs.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220301061500.2110569-8-dmitry.baryshkov@linaro.org