libqiprog: Add logging helpers

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
usb_host: Print log messages when appropriate

Make use of the newly introduced logging functionality.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
qiprog: Use highest debug libqiprog log level

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>