arm64: dts: qcom: x1e80100: Add PCIe nodes

Add nodes for PCIe 4 and 6 controllers and their PHYs for X1E80100 platform.

Co-developed-by: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Co-developed-by: Rajendra Nayak <quic_rjendra@quicinc.com>
Signed-off-by: Rajendra Nayak <quic_rjendra@quicinc.com>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240129-x1e80100-dts-missing-nodes-v6-7-2c0e691cfa3b@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>