Android BLE discovery: use discovery agent

Android can't scan for classic BT devices, so when BT support was first
added, we simply didn't use the discovery agent at all and relied on the
list of paired BT devices provided by Android.

This still worked fine for a lot of BLE devices that allowed 'bonding'
with the Android device - similar to pairing. But some BLE devices (like
the Shearwater Peregrine) don't support bonding and so our Android code
didn't see them at all.

With this commit we start a BLE only scan on Android to add to the list
of already paired devices.

Fixes: #2974

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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