arm64: dts: qcom: sm8550: Flatten the USB nodes

arm64: dts: qcom: sm8550: Flatten the USB nodes

Transition the USB controllers found in the SM8550 SoC to the newly
introduced, flattened representation of the Qualcomm USB block.

The reg and interrupts properties from the usb child node are merged
with their counterpart in the outer node, remaining properties and child
nodes are simply moved.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250811-topic-sm8x50-usb-flatten-v2-1-0bbb3ac292e4@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>