USB: serial: ftdi_sio: new hardware support - hameg power supply

I'd like to present my small patch enabling to use Hameg HM8143 programmable
power supply with linux.

Signed-off-by: Pawel Ludwikow <pludwiko@rab.ict.pwr.wroc.pl>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>