USB headset detection (Was: Pulster fixe(s) and rework)

[Andy Green]

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Somebody in the thread at some point said:

|    1. Charger (maybe with Y-cable) connected. Detected by 47 kOhm seen
on ID
|    pin. Set USB mode to host and turn off USB power supply.
|
|    2. USB headset connected. Detected by ? Set USB mode to host and
turn on
|    USB power supply.
|
|    3. USB host connected. Detected by ? Set USB mode to device and
turn off
|    USB power supply.

"?" here is meant to be ID pin level.  But we don't supply a USB device
breakout cable which would consistently do the right thing to ID, so it
means we can't make decisions based on ID level like a normal OTG setup.

- -Andy
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