Revert "SystemUI: Add ethernet network icon"

This reverts commit 0fdebb3b9ec1cb93ec36b6ea077f5e85c70c9403.

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/SignalClusterView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/NetworkController.java