Acquire proc lock prior to the call into AM service connection holder

Since that holder could grab the WM lock and call back into AMS.

Bug: 182885705
Test: atest CtsAppTestCases:ServiceTest
Change-Id: I41c477595caf4a43d8efad91343fe57bbb981a70

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -15647,9 +15647,11 @@ public class ActivityManagerService extends IActivityManager.Stub
             final ActivityServiceConnectionsHolder holder =
                     (ActivityServiceConnectionsHolder) connectionHolder;
             synchronized (ActivityManagerService.this) {
-                holder.forEachConnection(cr -> mServices.removeConnectionLocked(
-                        (ConnectionRecord) cr, null /* skipApp */, holder /* skipAct */,
-                        false /* enqueueOomAdj */));
+                synchronized (mProcLock) {
+                    holder.forEachConnection(cr -> mServices.removeConnectionLocked(
+                            (ConnectionRecord) cr, null /* skipApp */, holder /* skipAct */,
+                            false /* enqueueOomAdj */));
+                }
             }
         }