Remove deprecated telecom APIs. Mark others final.

Bug:
Change-Id: I8a04903052a964f3997b5bb36730b8b200c8e472
diff --git a/telecomm/java/android/telecom/AudioState.java b/telecomm/java/android/telecom/AudioState.java
index 9c03319..0720df3 100644
--- a/telecomm/java/android/telecom/AudioState.java
+++ b/telecomm/java/android/telecom/AudioState.java
@@ -54,14 +54,9 @@
     public static final int ROUTE_ALL = ROUTE_EARPIECE | ROUTE_BLUETOOTH | ROUTE_WIRED_HEADSET |
             ROUTE_SPEAKER;
 
-    /** Note: Deprecated, please do not use if possible. */
-    @SystemApi public final boolean isMuted;
-
-    /** Note: Deprecated, please do not use if possible. */
-    @SystemApi public final int route;
-
-    /** Note: Deprecated, please do not use if possible. */
-    @SystemApi public final int supportedRouteMask;
+    private final boolean isMuted;
+    private final int route;
+    private final int supportedRouteMask;
 
     public AudioState(boolean muted, int route, int supportedRouteMask) {
         this.isMuted = muted;