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).

src/driver/lcdd.h

@@ -64,6 +64,7 @@ typedef enum
 	FP_ICON_COL2       = 0x0B000002,
 	FP_ICON_CAM2       = 0x0C000001
 } fp_icon;
+#define CVFD CLCD
 
 #ifdef LCD_UPDATE
 #ifdef HAVE_CONFIG_H