usb: refactor usb drain time and print on debug
usb: refactor usb drain time and print on debug

This improves data on wait-timeouts for writes to drain,
and allows debugging of potential screen-still-on issues
without recompilation by running with CTLRA_DEBUG instead.

Signed-off-by: Harry van Haaren <6e1296516ee88185cd60d9725251227ece1af74d@gmail.com>

openAVproductions/openAV-Ctlra