wlan: Failed to Send Action frame.

When GO exist and  invites peer on the same
operating channel where GO is formed,i.e
when GO is on channel, if supplicant sends,
a non zero wait time , driver is not able to
send action frame. As a part of fix , setting
wait time as zero when GO is operating on channel
explicitly in driver.

Change-Id: I652060c53fb4b731b381ebb28996124bc39b4480
CRs-Fixed: 668530
wlan: Acquire rtnl lock while unregistering ioctls.

While unregistering ioctl, HOST will set wireless_handlers to NULL,
at the same time if kernel is processing any IOCTL command
(wireless_process_ioctl), there are chances of deferring
wireless_handler, leading to crash.
Hence, taking rtnl_lock while making wireless_handlers to NULL, as
same lock is taken while processing ioctl.

Change-Id: Idcd907fa345eae9e36d3698225aaa8780576f679
CRs-Fixed: 716024