wpa_supplicant_8:wext: Map the missing function call

Since the functions call were not mapped,signal strength
were not getting reported to userspace and network
connection was failing with poor network signal.Now
the right signal strengths are reported to the userspace.

Change-Id: I1a20205681dc0c9a73a078cce1b4ef633f11e894
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>
driver_wext: declare wext private lib functions up front else 4.2 build will fail

Change-Id: I6d6c7d5153738b0ddd4d217a513397987eeb7434