Put stopping service's host process on top of cached process list

stopService should be regarded as a service activity, thus after
the service gets stopped, its host process should stay on top of
all cached processes if it slips into cached state.

Bug: 162811773
Test: atest CtsAppTestCases:ActivityManagerTest
Change-Id: I4f42344c373e431b7b4418304f29e79c3dec1a0e

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

@@ -3868,6 +3868,8 @@ public final class ActiveServices {
                     r.name.getClassName());
             stopServiceAndUpdateAllowlistManagerLocked(r);
             if (r.app.getThread() != null) {
+                // Bump the process to the top of LRU list
+                mAm.updateLruProcessLocked(r.app, false, null);
                 updateServiceForegroundLocked(r.app.mServices, false);
                 try {
                     bumpServiceExecutingLocked(r, false, "destroy");