Snap for 4598635 from d835dec1baaa81927cfb21ddad78b5a461917069 to pi-release

Change-Id: I0846e809f43234f1148c7d72deec91ac6fff4992
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index 7037b56..9191994 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -99,8 +99,6 @@
 #define MMAP_PERIOD_COUNT_MAX 512
 #define MMAP_PERIOD_COUNT_DEFAULT (MMAP_PERIOD_COUNT_MAX)
 
-static const int64_t NANOS_PER_SECOND = 1000000000;
-
 /* This constant enables extended precision handling.
  * TODO The flag is off until more testing is done.
  */