bus/USB.h: header for usb device items

Change-Id: Ic36733af169948f54d7d938dfab1cb5aeb34ab9a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5956
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

listdev: list USB devices too

Change-Id: I14c626b6a37c95196ce87ec6b1bbb76ff14cdb4f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5955
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>