Applicable to AU/BU.
For 5.8GHz products with SW version below 2.0 this is the
frequency in MHz of the AU/BU after the next reset.
For units with SW version 2.0 and up this is the
frequency in MHz to use when the DFS Option is disabled.
(Replaces brzaccVLAUDefinedFrequency to support a resolution
of 0.5 MHz for units with HW revision C and higher).
For 5.8GHz products with SW version below 2.0 the range
is 5740 to 5830 MHz using 10MHz resolution.
For units with SW version 2.0 and up the range is as
defined in the selected Sub Band.