beacon handling fixups for adhoc mode:

o don't reclaim any previous beacon state in ath_beacon_alloc; do it
  explicitly in ath_newstate
o reference count the node held in the beacon frame state block
o process ibss merge more intelligently; let the state machine do the
  right thing instead of explicitly setting the new bssi id
o explicitly stop tx dma before doing beacon setup to handle the ibss
  merge case

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