greybus: add copyright statements

The Greybus audio source files included no copyright statements.
Add them.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
diff --git a/drivers/staging/greybus/audio-dai.c b/drivers/staging/greybus/audio-dai.c
index 0dd7364..9b162bf 100644
--- a/drivers/staging/greybus/audio-dai.c
+++ b/drivers/staging/greybus/audio-dai.c
@@ -1,3 +1,12 @@
+/*
+ * Greybus audio Digital Audio Interface (DAI) driver
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
diff --git a/drivers/staging/greybus/audio-gb-cmds.c b/drivers/staging/greybus/audio-gb-cmds.c
index f6a29ab..9ca3164 100644
--- a/drivers/staging/greybus/audio-gb-cmds.c
+++ b/drivers/staging/greybus/audio-gb-cmds.c
@@ -1,3 +1,12 @@
+/*
+ * Greybus audio commands
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
 #include <linux/kernel.h>
 
 #include "greybus.h"
diff --git a/drivers/staging/greybus/audio-pcm.c b/drivers/staging/greybus/audio-pcm.c
index a1faf78..c1b6aa5 100644
--- a/drivers/staging/greybus/audio-pcm.c
+++ b/drivers/staging/greybus/audio-pcm.c
@@ -1,3 +1,12 @@
+/*
+ * Greybus audio Pulse Code Modulation (PCM) driver
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
diff --git a/drivers/staging/greybus/audio.c b/drivers/staging/greybus/audio.c
index c873f33..57c738b 100644
--- a/drivers/staging/greybus/audio.c
+++ b/drivers/staging/greybus/audio.c
@@ -1,3 +1,12 @@
+/*
+ * Greybus audio driver
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
diff --git a/drivers/staging/greybus/audio.h b/drivers/staging/greybus/audio.h
index c9087c9fc..da95c1b 100644
--- a/drivers/staging/greybus/audio.h
+++ b/drivers/staging/greybus/audio.h
@@ -1,3 +1,12 @@
+/*
+ * Greybus audio
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
 #ifndef __GB_AUDIO_H
 #define __GB_AUDIO_H
 #include <linux/kernel.h>