[automerge] [pm] forbid deletion of protected packages 2p: dba7ceb57e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19942600

Bug: 242996180
Change-Id: Iadf145b648c17298f01cb085f6fa6ff12d8ad748
Merged-In: Iba408e536b340ea5d66ab499442c0c4f828fa36f