qcacld-3.0: Convert legacy chan ID usage to chan freq

Modify the following 2 APIs' code and parameters to make
sure they're using frequency instead of channel ID:
   csr_get_infra_operation_channel
   sme_search_in_base_ch_lst

Change-Id: I2010aac81a3297d2c274ac9f17784f8f5cbf846e
CRs-Fixed: 2554643
3 files changed