hostapd: Initial IEEE 802.11ax (HE) definitions

Add IEEE 802.11ax definitions for config, IEEE structures, and
constants. These are still subject to change in the IEEE process.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Git-commit: 94380cb40a64094bdaac0122a0123743c569b0b3
Git-repo : git://w1.fi/srv/git/hostap.git
CRs-fixed: 2013192

Change-Id: I561451daa9b9b4dd77011b2736ad844a65b5ae0a
10 files changed