USB: serial: constify device-id tables

Declare device-id tables as const where possible.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/usb/serial/ftdi_sio.c
Simple merge

diff --cc drivers/usb/serial/ipaq.c
Simple merge

diff --cc drivers/usb/serial/metro-usb.c
Simple merge

diff --cc drivers/usb/serial/qcaux.c
Simple merge

diff --cc drivers/usb/serial/safe_serial.c
Simple merge

diff --cc drivers/usb/serial/ti_usb_3410_5052.c
Simple merge

diff --cc drivers/usb/serial/visor.c
Simple merge