qcacld-3.0: Replace channel ID with channel frequency

Replace channel ID(rx_channel) with channel frequency(
rx_freq) in struct bss_description.

Remove a few camel cases in function
lim_collect_bss_description.

Change-Id: Ic6051fa62d2fe0aa10a6d2a3568aeff75daa813f
CRs-Fixed: 2492155
3 files changed