Move some IWindowManager methods to internal interface

The methods are only used in system server. It is unnecessary to
declare in aidl.

This also eliminates the confusion of missing permission check
for updateRotation().

Bug: 230863943
Test: atest WindowManagerPermissionTests
Change-Id: I703830650bab3a792982cada99aa1512430658a4

tests/permission/src/com/android/framework/permission/tests/WindowManagerPermissionTests.java

@@ -123,16 +123,6 @@ public class WindowManagerPermissionTests extends TestCase {
 
     @SmallTest
     public void testSET_ORIENTATION() {
-        try {
-            mWm.updateRotation(true, false);
-            fail("IWindowManager.updateRotation did not throw SecurityException as"
-                    + " expected");
-        } catch (SecurityException e) {
-            // expected
-        } catch (RemoteException e) {
-            fail("Unexpected remote exception");
-        }
-
         try {
             mWm.freezeRotation(-1);
             fail("IWindowManager.freezeRotation did not throw SecurityException as"