arm64: dts: qcom: qcs615: enable pcie

arm64: dts: qcom: qcs615: enable pcie

Add configurations in devicetree for PCIe0, including registers, clocks,
interrupts and phy setting sequence.

Add PCIe lane equalization preset properties for 8 GT/s.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Ziyue Zhang <ziyue.zhang@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250725112346.614316-2-ziyue.zhang@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>