Merge "Do not allow non-system dialogs on UsbConfirmAct" into rvc-qpr-dev am: 2a3a3a1de8 am: c10f2b5e59

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13146867

Change-Id: I9ece6f9c247fe760d035b1b0d22704307bb9c7fe