Port over the AR9285 PA calibration and initial calibration code from Linux ath9k.
The ath9k ar9002_hw_init_cal() isn't entirely clear about what is supposed to be called for what chipsets, so I'm ignoring the rest of it and just porting the AR9285 init cal path as-is and leaving the rest alone. Subsequent commits may also tidy up the Merlin (AR9285) and other chipset support.
Obtained from: Linux ath9k
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