ide: replace IDE_TFLAG_* flags by IDE_VALID_*

Replace IDE_TFLAG_{IN|OUT}_* flags meaning to the taskfile register validity on
input/output by the IDE_VALID_* flags and introduce 4 symmetric 8-bit register
validity indicator subfields, 'valid.{input/output}.{tf|hob}', into the 'struct
ide_cmd' instead of using the 'tf_flags' field for that purpose (this field can
then be turned from 32-bit into 8-bit one).

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 27bb70d..0fdf0df 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -40,7 +40,7 @@
 	struct ide_cmd cmd;
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_IN_ERROR;
+	cmd.valid.in.tf = IDE_VALID_ERROR;
 
 	drive->hwif->tp_ops->tf_read(drive, &cmd);
 
@@ -348,7 +348,7 @@
 	tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 
 	memset(&cmd, 0, sizeof(cmd));
-	cmd.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
+	cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
 	cmd.tf.feature = SETFEATURES_XFER;
 	cmd.tf.nsect   = speed;