arm64: dts: qcom: sa8155: Enable PCIe nodes

SA8155p ADP board supports the PCIe0 controller in the RC
mode (only). So add the support for the same.

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220326055754.1796146-3-bhupesh.sharma@linaro.org