serial: 8250_exar: Group CTI EEPROM offsets by device

It's not obvious from the first glance that the list of the CTI EEPROM
offsets covers three different models, let's group them accordingly for
better readability.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240920154430.3323820-1-andriy.shevchenko@linux.intel.com


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