ata: pata_pdc2027x: Fix some incorrect function names and parameter docs

Fixes the following W=1 kernel build warning(s):

drivers/ata/pata_pdc2027x.c:209: warning: expecting prototype for pdc2027x_pata_cable_detect(). Prototype was for pdc2027x_cable_detect() instead
drivers/ata/pata_pdc2027x.c:262: warning: expecting prototype for pdc2720x_mode_filter(). Prototype was for pdc2027x_mode_filter() instead
drivers/ata/pata_pdc2027x.c:513: warning: Function parameter or member 'board_idx' not described in 'pdc_adjust_pll'
drivers/ata/pata_pdc2027x.c:513: warning: expecting prototype for adjust_pll(). Prototype was for pdc_adjust_pll() instead
drivers/ata/pata_pdc2027x.c:599: warning: expecting prototype for detect_pll_input_clock(). Prototype was for pdc_detect_pll_input_clock() instead

Cc: Jens Axboe <[e-mail]>
Cc: Albert Lee <[e-mail]>
Cc: Andre Hedrick <[e-mail]>
Cc: Frank Tiernan <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/ata/pata_pdc2027x.c

···
 }
 
 /**
- *	pdc2027x_pata_cable_detect - Probe host controller cable detect info
+ *	pdc2027x_cable_detect - Probe host controller cable detect info
  *	@ap: Port for which cable detect info is desired
  *
  *	Read 80c cable indicator from Promise extended register.
···
 }
 
 /**
- *	pdc2720x_mode_filter	-	mode selection filter
+ *	pdc2027x_mode_filter	-	mode selection filter
  *	@adev: ATA device
  *	@mask: list of modes proposed
  *
···
 }
 
 /**
- * adjust_pll - Adjust the PLL input clock in Hz.
+ * pdc_adjust_pll - Adjust the PLL input clock in Hz.
  *
- * @pdc_controller: controller specific information
  * @host: target ATA host
  * @pll_clock: The input of PLL in HZ
+ * @board_idx: board identifier
  */
 static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int board_idx)
 {
···
 }
 
 /**
- * detect_pll_input_clock - Detect the PLL input clock in Hz.
+ * pdc_detect_pll_input_clock - Detect the PLL input clock in Hz.
  * @host: target ATA host
  * Ex. 16949000 on 33MHz PCI bus for pdc20275.
  *     Half of the PCI clock.