frameworks/base: support devices with SoftAp that don't require firmware...

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Partial forward port from ICS.
Original Change-Id: If2db6e8ce675c3214ce645231c7a354f41ea0cc6

Signed-off-by: cj360 <ayunker551@gmail.com>
Change-Id: Ie84b1709a4c402303aea77bdab3ec87233569efa