usbdev: Extract libusb1 device discovery into a separate file

Currently there is a TODO-like comment in the dediprog driver: "Might be
useful for other USB devices as well". Act on this comment by collecting
all the device discovery code for libusb1 devices into a separate file.

Change-Id: Idfcc79371241c2c1dea97faf5e532aa971546a79
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-on: https://review.coreboot.org/27443
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
5 files changed