asoc: csra: update mute register of csra66x0 codec

Update mute register of csra66x0 codec when
called from hw_free api.

Change-Id: I728d1ca3076899ad0e6dea4dcac28416b3e40b18
Signed-off-by: Sanjana B <sanjb@codeaurora.org>

asoc/codecs/csra66x0/csra66x0.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.
  */
 
 #ifndef _CSRA66X0_H
@@ -226,4 +226,6 @@
 #define FAULT_STATUS_TEMP           0x10
 #define FAULT_STATUS_PROTECT        0x20
 
+
+void csra66x0_hw_free_mute(struct snd_soc_component *component);
 #endif /* _CSRA66X0_H */