[rdkb][common][hal][Fix channel switch from auto channel to fixed channel]

[Description]
Fix channel switch from auto channel to fixed channel
1. refactor wifi_index_to_band, add delay to get band when auto channel enabled
2. refactor wifi_pushRadioChannel2 to support auto channel mode
3. refactor wifi_setRadioAutoChannelEnable => only need to set channel to zero

[Release-log]

1 file changed
tree: 1b9faf9955a711ffc93aeb26885608fafe214f44
  1. src/