neutrino: explicitly include vfd/lcd header

Instead of including it everywhere through global.h, just include
the lcd/vfd header where needed. Add a tiny helper header "display.h"
to divert between vfd.h (coolstream) and lcdd.h (everything else).


Origin commit data
------------------
Commit: 6b72095f5a
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2013-05-11 (Sat, 11 May 2013)

src/neutrino.cpp

@@ -59,6 +59,7 @@
 #include <driver/screenshot.h>
 #include <driver/volume.h>
 #include <driver/streamts.h>
+#include <driver/display.h>
 
 #include "gui/audiomute.h"
 #include "gui/audioplayer.h"