hal: Fix warnings

Change-Id: I402f6464932ab0acf035b4e270132165b4941963
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index abc9804..badc0bd 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -20,7 +20,9 @@
 #ifndef QCOM_AUDIO_HW_H
 #define QCOM_AUDIO_HW_H
 
+#include <stdlib.h>
 #include <cutils/list.h>
+#include <cutils/str_parms.h>
 #include <hardware/audio.h>
 #include <hardware/audio_amplifier.h>
 #include <tinyalsa/asoundlib.h>