qcacmn: Add the channel structure as an argument for ETSI preCAC check
While checking if ETSI preCAC is already done on a given channel
in this API "dfs_is_etsi_precac_done", dfs_curchan is always used as
the channel to be checked. Since there are APIs such as
"dfs_is_cac_required", which may be called before dfs_curchan is
updated, add the channel structure which is to be checked for
ETSI preCAC in the argument list.
Change-Id: I77cf059f9afd83c850a7603f6197ac2b78fa2586
CRs-Fixed: 2528023