arm64: dts: qcom: Use correct naming for dwc3 usb nodes in dts files

arm64: dts: qcom: Use correct naming for dwc3 usb nodes in dts files

The dwc3 usb nodes in several arm64 qcom dts are currently named
differently, somewhere as 'usb@<addr>' and somewhere as 'dwc3@<addr>',
leading to some confusion when one sees the entries in sysfs or
dmesg:
[    1.943482] dwc3 a600000.usb: Adding to iommu group 1
[    2.266127] dwc3 a800000.dwc3: Adding to iommu group 2

Name the usb nodes as 'usb@<addr>' for consistency, which is
the correct convention as per the 'snps,dwc3' dt-binding as
well (see [1]).

[1]. Documentation/devicetree/bindings/usb/snps,dwc3.yaml

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Link: https://lore.kernel.org/r/20210627114616.717101-2-bhupesh.sharma@linaro.org
[bjorn: Extended to also fix ipq6018]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>