Deep links on large screen devices starts a homepage activity on the
left pane, and then starts the target activity on the right pane. This
flow overrides the calling package, and the target activity can't know
who initially calls it.
Thus, we store the initial calling package in the intent, so the
Connected devices page is able to make bluetooth not discoverable when
it's called from unintended apps on large screen devices.
Bug: 234440688
Test: robotest, manual
Change-Id: I4ddcd4e083c002ece9d10aabdb4af4a41de55ce7
6dcbb25fa5