qcacld-3.0: Refine Max chanwidth selection for SAP chanswitch

Remove the calls to wlan_reg_dmn_get_opclass_from_channel API
when SAP is changing channel by ECSA/CSA.
The API accepts channel number and will cause issue when 6GHz
band is supported in target.

Change-Id: Ib6c67417f1a0edae88b5e714e3ed23c589e7eb62
CRs-Fixed: 2676354
5 files changed