cfg80211: add extensible feature flag attribute

With the wiphy::features flag being used up this patch adds a
new field wiphy::ext_features. Considering extensibility this
new field is declared as a byte array. This extensible flag is
exposed to user-space by NL80211_ATTR_EXT_FEATURES.

Cc: Avinash Patil <patila@marvell.com>
Signed-off-by: Gautam (Gautam Kumar) Shukla <gautams@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: d75bb06b61cb69ee6223d791d3bb230e68623b20
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


CRs-fixed: 1096202
Change-Id: Ib76b94b53b73e8b7a2755b0612d8ed3f860852b0
[pkushwah@codeaurora.org: changes in include/uapi/linux/nl80211.h were
already included to retain enum ordering for msm-3.18.]
Signed-off-by: Purushottam Kushwaha <pkushwah@codeaurora.org>