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

Partial forward port from ICS.
Original Change-Id: If2db6e8ce675c3214ce645231c7a354f41ea0cc6

Change-Id: Iacb2498ec0f567a0a7c4e0dbf9127b70f09223bd
Merge branch 'cm-12.0' into mkl