arm64: dts: ti: k3-am65-main: Cleanup "ranges" property in "pcie" DT node

*dtbs_check* on
"Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml" YAML file
resulted in the following errors.

pcie@5500000: ranges: 'oneOf' conditional failed, one must be fixed:
pcie@5600000: ranges: 'oneOf' conditional failed, one must be fixed

Cleanup "ranges" property in "pcie" DT node to fix the above errors.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210915055358.19997-7-kishon@ti.com