ide: move PIO blacklist to ide-pio-blacklist.c

Move PIO blacklist to ide-pio-blacklist.c.

While at it:

- fix comment

- fix whitespace damage

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 4e44525..535c439 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1305,6 +1305,8 @@
 		      struct ide_timing *, unsigned int);
 int ide_timing_compute(ide_drive_t *, u8, struct ide_timing *, int, int);
 
+int ide_scan_pio_blacklist(char *);
+
 u8 ide_get_best_pio_mode(ide_drive_t *, u8, u8);
 
 int ide_set_pio_mode(ide_drive_t *, u8);