qcacld-3.0: Remove channel and rename freq in hdd_connection_info

Convert channel to freq in hdd_connection_info, so
remove unused 'channel' and rename 'freq' to 'chan_freq'.

Change-Id: I0d3fd39f9ac3c2303729b27b7c97385097c82104
CRs-Fixed: 2508791
11 files changed