Once the radar is found, identify the affected sub 20 MHz channels in the
current channel. From the position(s) of the sub 20 MHz subchannels, find
the nearest valid puncturing pattern.
If a valid puncturing pattern is found, find the corresponding reduced
bandwidth new channel for the legacy ( <= 11AX) devices and send CSA. At
the end of CSA, do a vdev restart so that the 11BE devices see a new
puncturing pattern.
And If not found, then fallback to the default behavior of changing channel
using Random channel selection.
Change-Id: I41e6206f310722bc3dacc9ce8d024f679ff1af3e
CRs-Fixed: 3386022
589a32f847