ide: use ata_tf_protocols enums

* Add IDE_TFLAG_MULTI_PIO taskfile flag and set it for commands
  using multi-PIO protocol.

* Use ata_tf_protocols enums instead of TASKFILE_* defines to
  denote command's protocol and then rename ->data_phase field
  to ->protocol.

* Remove no longer needed <linux/hdreg.h> includes.

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-pm.c b/drivers/ide/ide-pm.c
index 5c9fc20..ebf2d21 100644
--- a/drivers/ide/ide-pm.c
+++ b/drivers/ide/ide-pm.c
@@ -1,6 +1,5 @@
 #include <linux/kernel.h>
 #include <linux/ide.h>
-#include <linux/hdreg.h>
 
 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 {
@@ -164,8 +163,8 @@
 	return ide_stopped;
 
 out_do_tf:
-	cmd->tf_flags	 = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
-	cmd->data_phase = TASKFILE_NO_DATA;
+	cmd->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
+	cmd->protocol = ATA_PROT_NODATA;
 
 	return do_rw_taskfile(drive, cmd);
 }