ASoC: hide bind/unbind in sysfs

Exposure of driver bind/unbind to userspace via sysfs may
lead to unexpected behavior.
Hide bind and unbind by driver attribute.

Change-Id: I20d6ee653bcc16af15d6368664aaf240c6645cd0
Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>

asoc/msm-pcm-q6-noirq.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/init.h>
@@ -1340,6 +1340,7 @@ static struct platform_driver msm_pcm_driver_noirq = {
 		.name = "msm-pcm-dsp-noirq",
 		.owner = THIS_MODULE,
 		.of_match_table = msm_pcm_noirq_dt_match,
+		.suppress_bind_attrs = true,
 	},
 	.probe = msm_pcm_probe,
 	.remove = msm_pcm_remove,