WiFi: Invoke getWifiLinkLayerStats() only if driver is loaded

When the screen state changes from off to on,
getWifiLinkLayerStats() is getting invoked even if the driver is
not loaded. Add a check to invoke the same only if driver is
loaded

Change-Id: I5cfa8990a354af033f977668a805da129d8f46c2
1 file changed
tree: bafbb40e21f171d9e5c4292117ba145f79990765
  1. service/