asoc: update relative header files

Move all relative header files to include folder.

Change-Id: Ic61a61a88823b4749dbe8c1f680d08201a3b4a48
Signed-off-by: Meng Wang <mengw@codeaurora.org>

asoc/codecs/wcd9xxx-slimslave.c

@@ -1,10 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2012-2017, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
  */
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/mfd/wcd9xxx/wcd9xxx_registers.h>
-#include "wcd9xxx-slimslave.h"
+#include <asoc/wcd9xxx-slimslave.h>
 
 struct wcd9xxx_slim_sch {
 	u16 rx_port_ch_reg_base;