cfg80211: basic support for PBSS network type

PBSS (Personal Basic Service Set) is a new BSS type for DMG
networks. It is similar to infrastructure BSS, having an AP-like
entity called PCP (PBSS Control Point), but it has few differences.
PBSS support is mandatory for 11ad devices.

Add support for PBSS by introducing a new PBSS flag attribute.
The PBSS flag is used in the START_AP command to request starting
a PCP instead of an AP, and in the CONNECT command to request
connecting to a PCP instead of an AP.

Change-Id: I9f26a8ff8433268240eb9443befadc0d279a0293
[liord@codeaurora.org: added missing attributes to nl80211.h
that were added in upstream kernel before the PBSS attribute,
in order to keep the ABI compatible]
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 00807f28573a101dc2833f0075e806b9874f306c
Git-repo: https://github.com/kvalo/ath.git


CRs-Fixed: 982931
Signed-off-by: Maya Erez <merez@codeaurora.org>