mac80211: VHT peer STA caps

As per Johannes review comments on PATCH v3, split into 2 patches and removed incomplete code of AP mode saving STA vht caps.

[PATCH v4 1/2]
Rename vht_capabilities to vht_cap

 include/linux/ieee80211.h |    2 +-
 net/mac80211/main.c       |    2 +-
 net/mac80211/mlme.c       |    4 ++--
 net/mac80211/util.c       |    4 ++--
 4 files changed, 6 insertions(+), 6 deletions(-)

[PATCH v4 2/2]
To save APs VHT capabilities in mac80211 under STA mode

 include/net/mac80211.h     |    3 +++
 net/mac80211/Makefile      |    1 +
 net/mac80211/ieee80211_i.h |    7 +++++++
 net/mac80211/mlme.c        |    5 +++++
 net/mac80211/util.c        |   12 ++++++++++++
 net/mac80211/vht.c         |   36 ++++++++++++++++++++++++++++++++++++
 6 files changed, 64 insertions(+), 0 deletions(-)