qcacmn: Fix reg_get_min_max_bw_on_cur_chan_list kernel doc
The kernel-doc script identified some documentation issues in
the doc of reg_get_min_max_bw_on_cur_chan_list, so fix those
issues.
Change-Id: I5f720706b8c744f39d4ad6f6dbd6e722c3d53096
CRs-Fixed: 3409405