Force landscape orientation for all Android applications

Open the following file from Android framework.

  - /android/frameworks/base/services/java/com/android/server/wm/WindowManagerService.java
  
  - Go to "computeForcedAppOrientationLocked" function.
  
  - Add below code at appropriate place.
  
        int req = getOrientationFromWindowsLocked();
        if (req == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {
            req = getOrientationFromAppTokensLocked();
        }
		    +req = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
        return req;