Revert "add display support for osmio4k+"

This reverts commit bf4e032a3b.

This commit is breaking build for osmio4kplus because of many
code parts, enums etc. are missing.

src/gui/vfd_setup.h

@@ -59,13 +59,4 @@ class CVfdSetup : public CMenuTarget, CChangeObserver, CActivateObserver
 		int exec(CMenuTarget *parent, const std::string &actionKey);
 };
 
-#ifdef ENABLE_LCD
-// lcd notifier
-class CLCDNotifier : public CChangeObserver
-{
-	public:
-		bool changeNotify(const neutrino_locale_t, void *Data);
-};
-#endif
-
 #endif