Annotate @SystemApi with required permissions.

Most @SystemApi methods should be protected with system (or higher)
permissions, so annotate common methods with @RequiresPermission to
make automatic verification easier.

Verification is really only relevant when calling into system
services (where permissions checking can happen on the other side of
a Binder call), so annotate managers with the new @SystemService
annotation, which is now automatically documented.

This is purely a docs change; no logic changes are being made.

Test: make -j32 update-api && make -j32 offline-sdk-docs
Bug: 62263906
Change-Id: I2554227202d84465676aa4ab0dd336b5c45fc651

telecomm/java/android/telecom/TelecomManager.java

@@ -18,6 +18,7 @@ import android.Manifest;
 import android.annotation.RequiresPermission;
 import android.annotation.SuppressAutoDoc;
 import android.annotation.SystemApi;
+import android.annotation.SystemService;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
@@ -48,6 +49,7 @@ import java.util.List;
  * descriptions.
  */
 @SuppressAutoDoc
+@SystemService(Context.TELECOM_SERVICE)
 public class TelecomManager {
 
     /**
@@ -1216,6 +1218,7 @@ public class TelecomManager {
      * @hide
      */
     @SystemApi
+    @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
     public boolean endCall() {
         try {
             if (isServiceConnected()) {