Don't use deprecated AudioState accessor

Use AudioState.getRoute() instead of AudioState.route

Bug:
Change-Id: I3f17efd597d5fff9355930c364d3449f9db797f7
diff --git a/src/com/android/server/telecom/CallAudioManager.java b/src/com/android/server/telecom/CallAudioManager.java
index aed592d..0078765 100644
--- a/src/com/android/server/telecom/CallAudioManager.java
+++ b/src/com/android/server/telecom/CallAudioManager.java
@@ -191,12 +191,12 @@
         if (isDocked) {
             // Device just docked, turn to speakerphone. Only do so if the route is currently
             // earpiece so that we dont switch out of a BT headset or a wired headset.
-            if (mAudioState.route == AudioState.ROUTE_EARPIECE) {
+            if (mAudioState.getRoute() == AudioState.ROUTE_EARPIECE) {
                 setAudioRoute(AudioState.ROUTE_SPEAKER);
             }
         } else {
             // Device just undocked, remove from speakerphone if possible.
-            if (mAudioState.route == AudioState.ROUTE_SPEAKER) {
+            if (mAudioState.getRoute() == AudioState.ROUTE_SPEAKER) {
                 setAudioRoute(AudioState.ROUTE_WIRED_OR_EARPIECE);
             }
         }