cfg80211: Enhance the AKM advertizement to support per interface

Commit ab4dfa20534e ("cfg80211: Allow drivers to advertise supported AKM
suites") introduces the support to advertize supported AKMs to userspace.

This needs an enhancement to advertize the AKM support per interface type,
specifically for the cfg80211-based drivers that implement SME and use
different mechanisms to support the AKM's for each interface type (e.g.,
the support for SAE, OWE AKM's take different paths for such drivers on
STA/AP mode).

This commit aims the same and enhances the earlier mechanism of advertizing
the AKMs per wiphy. Add new nl80211 attributes and data structure to
provide supported AKMs per interface type to userspace.

The AKMs advertized in akm_suites are default capabilities if not
advertized for a specific interface type in iftype_akm_suites.

Link: https://lore.kernel.org/r/20200126203032.21934-1-vjakkam@codeaurora.org
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git


Git-commit: d6039a3416f7af37c04f22c411f120ad46f51663
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
CRs-Fixed: 2632444
Change-Id: I6f33a6b27c38f7be09e9740fccaf750a2c148c31
Signed-off-by: Srikanth Marepalli <marepall@codeaurora.org>