Support extra files in UUUDriver, and pass usb device path

[hundeboll]

Teach the UUUDriver to syncrhonize extra files to the exporter before invoking uuu. This is useful the the "image" passed to uuu is a script file that references such extra files. In our case, we load the u-boot image twice (first SPL, then U-Boot proper). After U-Boot starts, we load a fitimage using uuu's fastboot support.

While working with UUUDriver, we might as well tell it what USB device path to operate, so we can attach multiple targets to a single exporter. Also, avoid messing up the pytest output by add -v to the uuu command.

This is tested using with and without a coordinator.

Checklist

• [ ] Documentation for the feature
• [ ] Tests for the feature

• [x] The arguments and description in doc/configuration.rst have been updated

• [ ] Add a section on how to use the feature to doc/usage.rst

• [ ] Add a section on how to use the feature to doc/development.rst

• [x] PR has been tested

• [ ] Man pages have been regenerated