ASoC: wsa883x: Add support for VBAT monitor

Add support for VBAT monitor on WSA883x speaker amplifier
for signal profiling.

Change-Id: I1544b601ac9ee4e8ed6da3839cc46914bbae5d93
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>

asoc/codecs/wsa883x/internal.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
  */
 
 #ifndef WSA883X_INTERNAL_H
@@ -118,6 +118,7 @@ struct wsa883x_priv {
 	void *handle;
 	int (*register_notifier)(void *handle,
 				struct notifier_block *nblock, bool enable);
+	struct delayed_work vbat_work;
 };
 
 static int32_t wsa883x_resource_acquire(struct snd_soc_component *component,