serial: 8250_exar: Replace custom EEPROM read with eeprom_93cx6

Replace the custom 93cx6 EEPROM read functions with the eeprom_93cx6
driver. This removes duplicate code and improves code readability.

Replace exar_ee_read() calls with eeprom_93cx6_read() or
eeprom_93cx6_multiread().

Add "select EEPROM_93CX6" to config SERIAL_8250_EXAR to ensure
eeprom_93cx6 driver is also compiled when 8250_exar driver is selected.

Note: Old exar_ee_read() and associated functions are removed in next
patch in this series.

Link to mailing list discussion with Andy Shevchenko for reference.

Link: https://lore.kernel.org/linux-serial/Ztr5u2wEt8VF1IdI@black.fi.intel.com/


Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Parker Newman <pnewman@connecttech.com>
Link: https://lore.kernel.org/r/1bf2214ae27130ca58b9e779c4d65a0e5db06fc1.1727880931.git.pnewman@connecttech.com


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