This feature adds support for platform capability BOS descriptors which allows
the device itself to ship quirk data.
Use `sudo fwupdtool get-devices --save-backends=FILENAME` to save fake backend
devices to a file. This allows easy creation of self tests that do not require
physical hardware.
Newer version of libgusb has g_usb_device_get_configuration_index which
will be used by cros-ec plugin.
Skip bumping this dependency on Debian and Ubuntu as of this commit date,
they don't know about 0.3.5 yet.
