Add logs for debugging flaky test

See b/154080003#comment2 for the detail.

Add logs to show when ACTION_PACKAGE_FULLY_REMOVED is received.
We can tell if the broadcast is late from the timestamp.

(Cherry-picked from 74bdcfcc16)

Bug: 154080003
Test: atest RollbackTest
Merged-In: I84234ba7cebe793c3bb1d0aab2739b22f5c7d11c
Change-Id: I84234ba7cebe793c3bb1d0aab2739b22f5c7d11c

services/core/java/com/android/server/rollback/RollbackManagerServiceImpl.java

@@ -301,10 +301,7 @@ class RollbackManagerServiceImpl extends IRollbackManager.Stub {
                 }
                 if (Intent.ACTION_PACKAGE_FULLY_REMOVED.equals(action)) {
                     String packageName = intent.getData().getSchemeSpecificPart();
-                    if (LOCAL_LOGV) {
-                        Slog.v(TAG, "broadcast=ACTION_PACKAGE_FULLY_REMOVED"
-                                + " pkg=" + packageName);
-                    }
+                    Slog.i(TAG, "broadcast=ACTION_PACKAGE_FULLY_REMOVED pkg=" + packageName);
                     onPackageFullyRemoved(packageName);
                 }
             }