serial: 8250_exar: Describe all parameters in kernel doc

serial: 8250_exar: Describe all parameters in kernel doc

Kernel doc validator is not happy:

 warning: Function parameter or struct member 'pcidev' not described in 'cti_get_port_type_xr17c15x_xr17v25x'
 warning: Function parameter or struct member 'pcidev' not described in 'cti_get_port_type_fpga'
 warning: Function parameter or struct member 'pcidev' not described in 'cti_get_port_type_xr17v35x'

Add missed descriptions.

Fixes: f7ce07062988 ("serial: exar: add CTI specific setup code")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Parker Newman <pnewman@connecttech.com>
Link: https://lore.kernel.org/r/20240503171917.2921250-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>