Apply @hide / @SystemApi to android.telecom.*

Move the android.telecom.* namespace back to @hide, and also mark it
with @SystemApi so that system-privileged apps can use them.

Bug: 18302450
Change-Id: I33ae1b9b0dfdb1c5eff51ca3c829196bcfc9411c
diff --git a/telecomm/java/android/telecom/AudioState.java b/telecomm/java/android/telecom/AudioState.java
index 43da38f..f78ce29 100644
--- a/telecomm/java/android/telecom/AudioState.java
+++ b/telecomm/java/android/telecom/AudioState.java
@@ -16,6 +16,7 @@
 
 package android.telecom;
 
+import android.annotation.SystemApi;
 import android.os.Parcel;
 import android.os.Parcelable;
 
@@ -24,7 +25,9 @@
 /**
  *  Encapsulates the telecom audio state, including the current audio routing, supported audio
  *  routing and mute.
+ *  @hide
  */
+@SystemApi
 public final class AudioState implements Parcelable {
     /** Direct the audio stream through the device's earpiece. */
     public static final int ROUTE_EARPIECE      = 0x00000001;