qcacld-3.0: Replace chan num with frequency about measurement request

Add frequency to tSirChannelInfo, not replace because channelNum has
specail meaning.
Replace channelNumber of struct report_channel_list.
Use channel frequency in functions which process measurement request

Change-Id: I615b1f61c2810474dac6daf1eeb1ce19c2b1da33
CRs-Fixed: 2559283
5 files changed