涉及的文件：
(1) 添加Ethernet .mk文件支持
- build/core/pathmap.mk
(2) framwork/base/
- Android.mk
- core/jni/Android.mk
- ethernet/EthernetStateTracker.java
- ethernet/EthernetManager.java
- erthernet/EthernetMonitor.java
- Ethernet/EthernetDevInfo.java
- Ethernet/EthernetNative.java
- Ethernet/EthernetDevInfo.aidl
- Ethernet/EthernetManager.aidl
- core/jni/android_net_ethernet_Ethernet.cpp
- core/jni/AndroidRunTime.cpp
- core/jni/android_net_NetUtils.cpp
- service/EthernetService.java
- service/SystemServer.java
- service/ConnectivityService.java
- core/java/android/provider/Settings.java
- core/java/android/app/ContextImpl.java
- core/java/android/content/Context.java
- core/res/res/values/config.xml
(3) system/core/
- init/property_service.c
(4)
- bionic/libc/kernel/common/linux/netlink.h