qcacmn: Allow FW to scan 6G chan based on RNR flag only

First host checks below two things in host scan request:
1. Userspace sets NL80211_SCAN_FLAG_COLOCATED_6GHZ flag
in host scan request.
2. At least one 6G channel is present in the host scan req.

If any of the above conditions satisfies, Host fills all
remaining (other than channel(s) present in host scan req)
valid 6 GHz channel(s) to scan requests and set the flag
FLAG_SCAN_ONLY_IF_RNR_FOUND for each remaining channel(s).

Host sends this updated channel list via WMI command
WMI_START_SCAN_CMDID_param_tlvs->channel_list for host scan
to firmware.

With this change, driver allows Firmware to scan 6G channels
based on RNR IEs only (for colocated APs reported by 2.4/5
GHz APs).

Change-Id: I2d9d2aac58bbc521b2476756d5919647bdc265cc
CRs-Fixed: 3103873