ide: add ide_pktcmd_tf_load() helper

Add ide_pktcmd_tf_load() helper and convert ATAPI device drivers to use it.

There should be no functionality changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 790ffa7..20969eb 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -968,6 +968,8 @@
 
 extern int drive_is_ready(ide_drive_t *);
 
+void ide_pktcmd_tf_load(ide_drive_t *, u32, u16, u8);
+
 /*
  * taskfile io for disks for now...and builds request from ide_ioctl
  */