asoc: wcd937x: move export functions to new header

For export functions from wcd937x use separate
header as internal header is only supposed to be
used within wcd937x driver logic.

Change-Id: Ice373ff95f7166a2f968458b25223c582edc7fba
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>

asoc/codecs/wcd937x/wcd937x.h

@@ -0,0 +1,27 @@
+/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _WCD937X_H
+#define _WCD937X_H
+
+#ifdef CONFIG_SND_SOC_WCD937X
+extern int wcd937x_info_create_codec_entry(struct snd_info_entry *codec_root,
+				    struct snd_soc_codec *codec);
+#else
+extern int wcd937x_info_create_codec_entry(struct snd_info_entry *codec_root,
+				    struct snd_soc_codec *codec)
+{
+	return 0;
+}
+#endif /* CONFIG_SND_SOC_WCD937X */
+
+#endif