Add changes for 11ax peer association.
Add support for the following
- update data structures to hold HE capabilities
- setting up HE capabilities in the session
- updating sta context with correct HE config
- intersecting self and peer capabilities
- update derivation of peer phymode to handle 11ax phymode
Change-Id: I46c7a7328d09e74bc0c5b25a67f6273d7eb04d30
CRs-Fixed: 1073481
0103ef8f7c