Move READ_PHONE_STATE compat id to @hide

Bug: 185121376
Test: atest CtsTelephony2TestCases CtsTelecomTestCases2
Change-Id: I0207faf30c85cc3275e312939bec570390129304
diff --git a/telecomm/java/android/telecom/TelecomManager.java b/telecomm/java/android/telecom/TelecomManager.java
index 4886789..1953af4 100644
--- a/telecomm/java/android/telecom/TelecomManager.java
+++ b/telecomm/java/android/telecom/TelecomManager.java
@@ -1011,6 +1011,7 @@
      * Enable READ_PHONE_STATE protection on APIs querying and notifying call state, such as
      * {@code TelecomManager#getCallState}, {@link TelephonyManager#getCallStateForSubscription()},
      * and {@link android.telephony.TelephonyCallback.CallStateListener}.
+     * @hide
      */
     @ChangeId
     @EnabledSince(targetSdkVersion = Build.VERSION_CODES.S)