wifi: Set the mode at native layer

 * Set normal/AP mode so that the HAL can specify correct module
   arguments when loading the driver.

Change-Id: I6eee2cc53b5f1e70306e252e52c909833f220515

Conflicts:
	wifi/java/android/net/wifi/WifiNative.java
	wifi/java/android/net/wifi/WifiStateMachine.java