[[logan][RDKB]fix 6G ext_ch/channelsInUse dmcli test issues]

[Description]
Fix the wrong results that 6G dmcli get ext_ch and channelsInUse

Solution:
1)refine the ext_ch getting flow, compare the center ch and primary ch;
2)use wifi_getRadioOperatingChannelBandwidth to get the current bw in
channelsInUse getting flow

[Release-log]
N/A

1 file changed
tree: 2052c894a2f9dbcb365cc0d6a2b2b145677c952a
  1. src/