Include necessary definition, service for wlan function.
Bug: 228913716
Test: WiFi can be enabled with "adb shell cmd wifi set-wifi-enabled enabled"
Test: WiFi can scan with "adb shell cmd wifi start-scan"
Test: WiFi can get scan result with "adb shell cmd wifi list-scan-results"
Test: WiFi can connect to an AP with "adb shell cmd wifi connect-network GoogleGuest open"
Test: WiFi can ping with "adb shell ping www.google.com"
Change-Id: I8798cc1662191f72d672d6b40f92d1ce62b84c74
