Revert "Add API for external call audio route."

Revert "Add CTS coverage for new external audio route API."

Revert submission 16308028-external-audio

Reason for revert: Don't want to launch this in T now
Reverted Changes:
I6634c752a:Add CTS coverage for new external audio route API....
Ibd1c2880e:Add API for external call audio route.
I3e262a913:Implement new external audio route.

Change-Id: I3a3eab1151b825523499058040c14696ea2887e9
diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index ce9530c..d94fafc 100644
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -701,15 +701,8 @@
          */
         public static final int PROPERTY_CROSS_SIM = 0x00004000;
 
-        /**
-         * Connection is a tethered external call.
-         * Indicates that the {@link Connection} is fixed on this device but the audio streams are
-         * re-routed to another device.
-         */
-        public static final int PROPERTY_TETHERED_CALL = 0x00008000;
-
         //******************************************************************************************
-        // Next PROPERTY value: 0x00010000
+        // Next PROPERTY value: 0x00004000
         //******************************************************************************************
 
         private final @CallState int mState;
@@ -906,9 +899,6 @@
             if (hasProperty(properties, PROPERTY_CROSS_SIM)) {
                 builder.append(" PROPERTY_CROSS_SIM");
             }
-            if (hasProperty(properties, PROPERTY_TETHERED_CALL)) {
-                builder.append(" PROPERTY_TETHERED_CALL");
-            }
             builder.append("]");
             return builder.toString();
         }