m68k: drop unused parts of 68VZ328 Makefile

DRAGEN2 should obviously be CONFIG_DRAGEN2, but the screen.h entry it
triggers only references files that are nowhere to be found in the
current tree. Besides, nothing uses screen.h. So just drop all that.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68k/platform/68VZ328/Makefile

 #
-# Makefile for arch/m68knommu/platform/68VZ328.
+# Makefile for arch/m68k/platform/68VZ328.
 #
 
 obj-y		:= config.o
-extra-$(DRAGEN2):= screen.h
-
-$(obj)/screen.h: $(src)/screen.xbm $(src)/xbm2lcd.pl
-	perl $(src)/xbm2lcd.pl < $(src)/screen.xbm > $(obj)/screen.h
-
-clean-files := $(obj)/screen.h