usb: otg: add proxy_wait handler to otg_id
Some otg_id handlers can detect what's connected but can't detect a change.
This allows that handler to pass off the waiting for ID change to a proxy.
Change-Id: Ib38b750c3da4bffc35e37b620ecee37c5d64d31f
Signed-off-by:
Erik Gilling <konkers@android.com>
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