nl80211: add an option to allow MFP without requiring it

The user space can now allow the kernel to associate to an AP that
requires MFP or that doesn't have MFP enabled in the same
NL80211_CMD_CONNECT command, by using a new NL80211_MFP_OPTIONAL flag.
The driver / firmware will decide whether to use it or not.

Include a feature bit to advertise support for NL80211_MFP_OPTIONAL.
This allows new user space to run on old kernels and know that it
cannot use the new attribute if it isn't supported.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Change-Id: I8dc2c341e44ccf9877ebfcbf645eb2d00c58222c
Git-commit: 65026002d69de006e273749bb799d3b01b757eb0
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


CRs-fixed: 2173869
Signed-off-by: Peng Xu <pxu@codeaurora.org>