Hal: Add missing header <limits.h>

Test: vts-tradefed run vts --module VtsHalAudioV2_0Target
Test: call/play music/record/video...
Bug: 36311550
Change-Id: I04976b718827d704cb77dc934a4e76e28d3adcf9
Signed-off-by: Kevin Rocard <krocard@google.com>
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index 4c306d0..7d9a366 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -33,6 +33,7 @@
 #include <dlfcn.h>
 #include <sys/resource.h>
 #include <sys/prctl.h>
+#include <limits.h>
 
 #include <cutils/log.h>
 #include <cutils/trace.h>