qcacmn: Change utils_fill_dfs_chan_info to dfs_fill_chan_info

Change the name of utils_fill_dfs_chan_info to dfs_fill_chan_info since it
is not used by any components other than DFS.

Change-Id: I91e8d2326a830303fbad4564aa13655e50caa4c4
CRs-Fixed: 2375672
1 file changed