[ide] cleanup it8172

In drivers/ide/pci/it8172.h, it8172_ratefilter() and
init_setup_it8172() are declared and the latter is referenced
in it8172_chipsets.  Both functions are not defined or used
anywhere.  This patch removes the prototypes and reference.
it8172 should be compilable now.
Signed-off-by: Tejun Heo <tj@home-tj.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/pci/it8172.h

@@ -6,7 +6,6 @@
 #include <linux/ide.h>
 
 static u8 it8172_ratemask(ide_drive_t *drive);
-static u8 it8172_ratefilter(ide_drive_t *drive, u8 speed);
 static void it8172_tune_drive(ide_drive_t *drive, u8 pio);
 static u8 it8172_dma_2_pio(u8 xfer_rate);
 static int it8172_tune_chipset(ide_drive_t *drive, u8 xferspeed);
@@ -14,14 +13,12 @@ static int it8172_tune_chipset(ide_drive_t *drive, u8 xferspeed);
 static int it8172_config_chipset_for_dma(ide_drive_t *drive);
 #endif
 
-static void init_setup_it8172(struct pci_dev *, ide_pci_device_t *);
 static unsigned int init_chipset_it8172(struct pci_dev *, const char *);
 static void init_hwif_it8172(ide_hwif_t *);
 
 static ide_pci_device_t it8172_chipsets[] __devinitdata = {
 	{	/* 0 */
 		.name		= "IT8172G",
-		.init_setup	= init_setup_it8172,
 		.init_chipset	= init_chipset_it8172,
 		.init_hwif	= init_hwif_it8172,
 		.channels	= 2,