ppc4xx: Do not stop booting on any keypress on dlvision-10g

Use CONFIG_AUTOBOOT_KEYED on dlvision-10g so that booting can only be
stopped with well defined keypresses.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/dlvision-10g.h b/include/configs/dlvision-10g.h
index c3f7438..4fc5262 100644
--- a/include/configs/dlvision-10g.h
+++ b/include/configs/dlvision-10g.h
@@ -42,6 +42,10 @@
 
 #define CONFIG_SYS_CLK_FREQ	33333333 /* external frequency to pll   */
 
+#undef CONFIG_ZERO_BOOTDELAY_CHECK     /* ignore keypress on bootdelay==0 */
+#define CONFIG_AUTOBOOT_KEYED          /* use key strings to stop autoboot */
+#define CONFIG_AUTOBOOT_STOP_STR " "
+
 /*
  * Configure PLL
  */