ARM: dts: qcom: ipq8064: align USB node names with bindings

Bindings expect USB controller node names to be named "usb".

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230420075053.41976-7-krzysztof.kozlowski@linaro.org