devicekit-power: add libusb-compat dependency

* otherwise do_configure fails with:
  | configure:14379: result: no
  | configure:14379: checking for usb.h
  | configure:14379: result: no
  | configure:14386: error: Can't find usb.h. Please install libusb.

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>