cfg80211: Allow BSS hint to be provided for connect

This clarifies the expected driver behavior on the older
NL80211_ATTR_MAC and NL80211_ATTR_WIPHY_FREQ attributes and adds a new
set of similar attributes with _HINT postfix to enable use of a
recommendation of the initial BSS to choose. This can be helpful for
some drivers that can avoid an additional full scan on connection
request if the information is provided to them (user space tools like
wpa_supplicant already has that information available based on earlier
scans).

In addition, this can be used to get more expected behavior for cases
where a specific BSS should be picked first based on operations like
Interworking network selection or WPS. These cases were already easily
addressed with drivers that leave BSS selection to user space, but there
was no convenient way to do this with drivers that take care of BSS
selection internally without using the NL80211_ATTR_MAC which is not
really desired since it is needed for other purposes to force the
association to remain with the same BSS.

CRs-Fixed: 605665
Change-Id: I4fdeaeced165551241b981e113c1f3c8b2705be2
Signed-off-by: Jouni Malinen <j@w1.fi>
[add const, fix policy]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 1df4a51082df6e5b0b8eb70df81885b9b4c9e6ec
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-testing.git


Signed-off-by: Pradeep Reddy POTTETI <ppotte@codeaurora.org>