Hide Phone proximity sensor methods

Has to be done in master and not m-wireless-dev, because
m-wireless-dev doesn't contain system-api/23.txt.

Bug: 20160495
Change-Id: I910b3ecafd78c31081b38325b436b4f2b5a54c8d

api/system-current.txt

@@ -32089,8 +32089,6 @@ package android.telecom {
     method public final void removeListener(android.telecom.Phone.Listener);
     method public final void setAudioRoute(int);
     method public final void setMuted(boolean);
-    method public final void setProximitySensorOff(boolean);
-    method public final void setProximitySensorOn();
   }
 
   public static abstract class Phone.Listener {

telecomm/java/android/telecom/Phone.java

@@ -244,6 +244,8 @@ public final class Phone {
      * become active, and the touch screen and display will be turned off when the user's face
      * is detected to be in close proximity to the screen. This operation is a no-op on devices
      * that do not have a proximity sensor.
+     *
+     * @hide
      */
     public final void setProximitySensorOn() {
         mInCallAdapter.turnProximitySensorOn();
@@ -257,6 +259,8 @@ public final class Phone {
      * @param screenOnImmediately If true, the screen will be turned on immediately if it was
      * previously off. Otherwise, the screen will only be turned on after the proximity sensor
      * is no longer triggered.
+     *
+     * @hide
      */
     public final void setProximitySensorOff(boolean screenOnImmediately) {
         mInCallAdapter.turnProximitySensorOff(screenOnImmediately);