adrian be5ba4a1c6 Prepare for improved (read: pcie) suspend/resume support.
* Flesh out the pcie disable method for 11n chips, as they were defaulting
  to the AR5212 (empty) PCIe disable method.

* Add accessor macros for the HAL PCIe enable/disable calls.

* Call disable on ath_suspend()

* Call enable on ath_resume()

NOTE:

* This has nothing to do with the NIC sleep/run state - the NIC still
  will stay in network-run state rather than supporting network-sleep
  state.  This is preparation work for supporting correct suspend/resume
  WARs for the 11n PCIe NICs.

TODO:

* It may be feasible at this point to keep the chip powered down during
  initial probe/attach and only power it up upon the first configure/reset
  pass.  This however would require correct (for values of "correct")
  tracking of the NIC power configuration state from the driver and that
  just isn't attempted at the moment.

Tested:

* AR9280 on my Lenovo T60, but with no suspend/resume pass (yet).
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