serial: 8250_exar: derive nr_ports from PCI ID for Acces I/O cards

In the similar way how it's done in 8250_pericom, derive the number of
the UART ports from PCI ID for Acces I/O cards.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220127180608.71509-1-andriy.shevchenko@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>