qcacld-3.0: Add support to get fwr phymode for frequency

Currently, wifi-pos uses channel number to get the fwr phymode.
For adding 6g support wifi-pos need to get the phymode from
frequency instead of channel number.
As a part of fix, Add handler for getting phymode based on
frequency

CRs-Fixed: 2617906
Change-Id: Ie65b3ed98760cef152df3697805593efbad4d5a1
2 files changed