audio: Rename header guard macro

Change-Id: I350616da3ba98965d2dcdd533e57d77b0ac7e41a
diff --git a/audio/audio_hw.h b/audio/audio_hw.h
index 87b7a93..9252e1c 100644
--- a/audio/audio_hw.h
+++ b/audio/audio_hw.h
@@ -15,8 +15,8 @@
  * limitations under the License.
  */
 
-#ifndef NVIDIA_AUDIO_HW_H
-#define NVIDIA_AUDIO_HW_H
+#ifndef SAMSUNG_AUDIO_HW_H
+#define SAMSUNG_AUDIO_HW_H
 
 #include <cutils/list.h>
 #include <hardware/audio.h>
@@ -433,4 +433,4 @@
  * lock_inputs must be held in order to either close the input stream, or prevent closure.
  */
 
-#endif // NVIDIA_AUDIO_HW_H
+#endif // SAMSUNG_AUDIO_HW_H