qcacld-3.0: config 11ax linkspeed rate

This change is to support 11ax linkspeed rate
on UI.

It supports different config for gReportMaxLinkSpeed.

Current 11ax rate support to max 80 nss2 mcs11.

Change-Id: Iff8cbafe1354ab50c4b3a90ef8ab698a3350a21d
CRs-Fixed: 2529291
16 files changed