qcacld-3.0: Replace channel ID with frequency (bss_description 2)

Prepare to replace channel id with channel frequency of struct
bss_description, first cleanup reference of channel id of struct
bss_description in lim_api.c csr_api_scan.c csr_host_scan_roam.c
csr_roam_preauth.c csr_util.c, use channel frequency instead.

Change-Id: I86864c73c429c52399819532cd9b957f66ed94f0
CRs-Fixed: 2491406
5 files changed