ieee80211: update HE IEs to D4.0 spec

Update the out-dated comments as well, and have them point to
the correct sections in the D4.0 spec.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: abaea61c79ea7a03fde7db5b48414143546b07c4
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


CRs-Fixed: 2743684
Change-Id: I1bc76e6c282312ed46ec977f8de56dc8e100bd3b
Signed-off-by: Vinita S. Maloo <vmaloo@codeaurora.org>