serial: 8250_exar: Make use of PCI_DEVICE_DATA() macro

Since PCI core provides a generic PCI_DEVICE_DATA() macro,
replace contents of EXAR_DEVICE() with former one.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200512140252.67631-1-andriy.shevchenko@linux.intel.com


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