audio: Fix APTX Adaptive latency value.

-latency value returnd for aptx adaptive is not proper as it uses
 default value in case statement, add break to return proper value.

Change-Id: I5a910c3fbd85474562c7b959b3b855679177a60f
diff --git a/hal/audio_extn/a2dp.c b/hal/audio_extn/a2dp.c
index 7dedc48..f83ea6a 100644
--- a/hal/audio_extn/a2dp.c
+++ b/hal/audio_extn/a2dp.c
@@ -2227,6 +2227,7 @@
             break;
         case ENC_CODEC_TYPE_APTX_AD: // for aptx adaptive the latency depends on the mode (HQ/LL) and
             latency = slatency;      // BT IPC will take care of accomodating the mode factor and return latency
+            break;
         default:
             latency = 200;
             break;