qca-wifi: Set WMI restricted 80+80 MHz as unavailable for pre-lithium chipsets
Restricted 80+80 MHz feature is not supported for pre-lithium chipsets.
Therefore set restricted 80+80 as unavailable.
Change-Id: I80603ea814d24a29588ec5d62a8ac2d0ac3b86ba
CRs-Fixed: 2580513