arm64: dts: qcom: qcs6490-rb3gen2: Add PCIe nodes

Enable PCIe1 controller and its corresponding PHY nodes on
qcs6490-rb3g2 platform.

SMMU v2 has limited SID's to assign dynamic SID's with the existing
logic. For now, use static iommu-map table assigning unique SID's for
each port as dynamic approach needs boarder community discussions.

PCIe switch connected to this board has 3 downstream ports and
to the one of the downstream an embedded ethernet is connected.
Assign unique SID for each downstream port and to embedded ethernet,
and also reserve a SID for the endpoints which are going to be
connected to the other two downstream ports.

As this PCIe switch is present in this platform only update iommu-map
in this platform only as other board variants might have different
PCIe topology and might need different mapping.

Signed-off-by: Krishna chaitanya chundru <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

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