Add bluetooth fixes to the AR5416/AR92xx HAL:

* Call the bluetooth setup function during the reset path, so the bluetooth
  settings are actually initialised.
* Call the AR9285 diversity functions during bluetooth setup; so the AR9285
  diversity and antenna configuration registers are correctly programmed
* Misc debugging info.

Tested:

* AR9285+AR3011 bluetooth combo; this code itself doesn't enable bluetooth
  coexistence but it's part of what I'm currently using.
Add accessor macros for the bluetooth coexistence routines.