qcacld-3.0: Correct 160MHz SAP dfs flag

Use wlan_reg_get_channel_state_for_freq API to get channel
state and identify 6Ghz channel as non-dfs channel.

Change-Id: Ib134a71c62e24324abc12e5a5b11a524e89de810
CRs-Fixed: 2681608
4 files changed