qcacmn: Rename dfs timer free function

1. Rename XXX_timer_free() dfs functions as XXX_timer_detach().
2. Remove the code to free precac_nol_list from
   dfs_zero_cac_timer_detach(). This is the redundant code since
   dfs_reset() already frees the precac_nol_list.

Change-Id: I878f396795ce0e5c04af379a6db253d07ca66a83
CRs-Fixed: 2262081
9 files changed