Fix deadlock between PackageManager and DisplayManager

UpdateOwnershipHelper#readUpdateOwnerDenyList calls getResources()
that will call getDisplayMetrics. In DisplayMetrics() that needs to
access a lock in DisplayManagerGlobal. When calling this method
inside mPm.mLock, it may trigger the deadlock between PackageManager
and DisplayManager.

To fix this issue, try to get the denylist in the handler thread and
outside the mPm.mLock.

Bug: 305615356
Test: manual. Add logs to make sure getResources() doesn't be called
inside mPm.mLock

Change-Id: I3dea7b1df6f115d7c1cffda6a9d51070a5d7dd80