qcacmn: Refine chan_list to chan_freq_list

Refine chan_list to chan_freq_list for below functions:

ucfg_scan_filter_valid_channel
scm_filter_valid_channel
scm_filter_channels

Change-Id: Ia1e82c5ac4cea4e48844b925e30947e945c40ee4
CRs-Fixed: 2570954
4 files changed