serial: sc16is7xx: add driver name to struct uart_driver

serial: sc16is7xx: add driver name to struct uart_driver

Make sure that the driver name is displayed instead of "unknown" when
displaying the driver infos:

Before:
    grep ttySC /proc/tty/drivers
    unknown              /dev/ttySC    243 0-7 serial

After:
    grep ttySC /proc/tty/drivers
    sc16is7xx            /dev/ttySC    243 0-7 serial

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20231221231823.2327894-10-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>