Support Power HAL AIDL service

Bug: 148798433
Test: Build
Change-Id: Ie14d90bf17faad68beb16a9916e2fab9627b1eb4
diff --git a/hal/audio_perf.h b/hal/audio_perf.h
index b564938..2fa1160 100644
--- a/hal/audio_perf.h
+++ b/hal/audio_perf.h
@@ -17,15 +17,17 @@
 #ifndef __QAUDIOPERF_H__
 #define __QAUDIOPERF_H__
 
+#include <stdbool.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-int audio_streaming_hint_start();
-int audio_streaming_hint_end();
-
-int audio_low_latency_hint_start();
-int audio_low_latency_hint_end();
+// return true on success, false on failure
+bool audio_streaming_hint_start();
+bool audio_streaming_hint_end();
+bool audio_low_latency_hint_start();
+bool audio_low_latency_hint_end();
 
 #ifdef __cplusplus
 }