hammerhead: stop dhcpcd when stop wpa_supplicant service
hammerhead: stop dhcpcd when stop wpa_supplicant service

Change-Id: I7fa30653202ace46ead1d94103d25535eed84ca7

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead