iommu/amd: Correct the wrong setting of alias DTE in do_attach

In below commit alias DTE is set when its peripheral is
setting DTE. However there's a code bug here to wrongly
set the alias DTE, correct it in this patch.

commit e25bfb56ea7f046b71414e02f80f620deb5c6362
Author: Joerg Roedel <[e-mail]>
Date: Tue Oct 20 17:33:38 2015 +0200

iommu/amd: Set alias DTE in do_attach/do_detach

Signed-off-by: Baoquan He <[e-mail]>
Tested-by: Mark Hounschell <[e-mail]>
Cc: [e-mail] # v4.4
Signed-off-by: Joerg Roedel <[e-mail]>

drivers/iommu/amd_iommu.c

···
 	/* Update device table */
 	set_dte_entry(dev_data->devid, domain, ats);
 	if (alias != dev_data->devid)
-		set_dte_entry(dev_data->devid, domain, ats);
+		set_dte_entry(alias, domain, ats);
 
 	device_flush_dte(dev_data);
 }