[layoutlib] remove PackageInfoFlags annotation am: 9de02db690

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/layoutlib/+/16324041

Change-Id: I0d553494916d8abbcbdc4bbf54c2a2fe8a99889d