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: f7ce070 ("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>

Author: andy-shev

drivers/tty/serial/8250/8250_exar.c

@@ -715,6 +715,7 @@ static int cti_read_osc_freq(struct exar8250 *priv, u8 eeprom_offset)
 /**
  * cti_get_port_type_xr17c15x_xr17v25x() - Get port type of xr17c15x/xr17v25x
  * @priv: Device's private structure
+ * @pcidev: Pointer to the PCI device for this port
  * @port_num: Port to get type of
  *
  * CTI xr17c15x and xr17v25x based cards port types are based on PCI IDs.
@@ -807,6 +808,7 @@ static enum cti_port_type cti_get_port_type_xr17c15x_xr17v25x(struct exar8250 *p
 /**
  * cti_get_port_type_fpga() - Get the port type of a CTI FPGA card
  * @priv: Device's private structure
+ * @pcidev: Pointer to the PCI device for this port
  * @port_num: Port to get type of
  *
  * FPGA based cards port types are based on PCI IDs.
@@ -836,6 +838,7 @@ static enum cti_port_type cti_get_port_type_fpga(struct exar8250 *priv,
 /**
  * cti_get_port_type_xr17v35x() - Read port type from the EEPROM
  * @priv: Device's private structure
+ * @pcidev: Pointer to the PCI device for this port
  * @port_num: port offset
  *
  * CTI XR17V35X based cards have the port types stored in the EEPROM.