hwui: Don't discard framebuffer on exynos4

The layers gets empty/not cleaned and redrawn on top of the preview,
causing beautiful glitch on homescreen, and drawing black instead
of transparency.

Change-Id: I633b104224c73c625f1193ee3dde41823cddc5bf
Framework: Forward port ADB over network (Part 2 of 2)

Includes:
- ADB Over Network, integration of the adb-host mode (already present)
  The feature can be used/tested without the Settings part:

    setprop service.adb.tcp.port 5555

  Note: This ADB setting is not persistent (for security purpose) and
  require init.rc implementation event like this : http://bit.ly/AdbTcpIP

  Author: Tanguy Pruvot
  Id: I5c61a53948349c785356cb5aae165110d75e3074

Change-Id: I101216c5b8ddff5040d9eeaf35afefc5cd98bbf3

Conflicts:
	services/java/com/android/server/SystemServer.java
Revert "Framework: Forward port ADB over network (Part 2 of 2)"

This reverts commit 4155d1efe5273ce9c046703f5afc2f91fbd79484.