WifiState: Don't aquire transitionwakelock in airplane mode

NetworkTransitionWakelock is for transition from Wifi to mobile.
It will cause device no sleep for 60s. There is no need to acquire
it in airplane mode.

Change-Id: I1487dc4787948d09e482f22e88d01768b54964da
Merge "WifiState: Don't aquire transitionwakelock in airplane mode" into kitkat