USB: serial: add support for multi-port simple drivers
USB: serial: add support for multi-port simple drivers

Add support for multi-port simple drivers.

Signed-off-by: Johan Hovold <759412786bc533369b22377bf83fb9056c5b25b2@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs