Enable the wmi_service to fetch the radar found cfreq from
wmi_service_radar_found_chan_freq_eq_center_freq.
Add changes in DFS random channel selection algorithm
(1) To find a channel of input width 320MHZ. Since 320MHZ in 5G
is 240MHZ (320 - 80 punctured), there are 12 valid 20MHZ subchannels
possible in 240MHZ. Validate the continuity of 240MHZ channel before
declaring the channel to be found.
(2) To find a fallback channel for the input channel
width of CH_WIDTH_320MHZ. The fallback channel of 320MHHZ is
160MHZ.
CRs-Fixed: 3149475
Change-Id: I03cac7f090de20efd912402b5e4df543b47aafed
4f3cbf6b28