cfg80211: Add support for aborting an ongoing scan

Implement new functionality for aborting an ongoing scan.

Add NL80211_CMD_ABORT_SCAN to the nl80211 interface. After
aborting the scan, driver shall provide the scan status by
calling cfg80211_scan_done().

Reviewed-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Vidyullatha Kanchanapally <vkanchan@qti.qualcomm.com>
Signed-off-by: Sunil Dutt <usdutt@qti.qualcomm.com>
[change command to take wdev instead of netdev so that it
 can be used on p2p-device scans]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 91d3ab46730379e89e1e908c6f62fbcadb3d8f08
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Change-Id: I071841cfea5b0da72f70032d0d99b05678d3d747
CRs-fixed: 930859
[vidyullatha@codeaurora.org: backport to 3.18 - This commit includes
the changes from following commits in include/uapi/linux/nl80211.h to
enum nl80211_commands to compile for msm-3.18.
66be7d2bcd826344894be09dc385f9f805136b84:
cfg80211: add ops to query mesh proxy path table,
6e0bd6c35b021dc73a81ebd1ef79761233c48b50:
cfg80211: 802.11p OCB mode handling,
f8d7552e945d38bd8d2e9c23aebf98042ce12302:
cfg80211: add channel switch started notification,
1057d35ede5dbf7ed7842357564fb42c9b54ba50:
cfg80211: introduce TDLS channel switch commands,
b0d7aa59592b4270531de5ce65dcf18338a2d98c:
cfg80211: allow wiphy specific regdomain management.]
Signed-off-by: Vidyullatha Kanchanapally <vidyullatha@codeaurora.org>