mpc83xx: don't disable autoboot

bootdelay set to -1 'permanently' disables autobooting, even if
bootcmd is specified.  Change to a positive value to allow
autobooting when a bootcmd is set.

Reported-by: Coray Tate <Coray.Tate@freescale.com>
Cc: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

include/configs/MPC8313ERDB.h

@@ -597,7 +597,7 @@
 #define CONFIG_FDTFILE		mpc8313erdb.dtb
 
 #define CONFIG_LOADADDR		500000	/* default location for tftp and bootm */
-#define CONFIG_BOOTDELAY	-1	/* -1 disables auto-boot */
+#define CONFIG_BOOTDELAY	6	/* -1 disables auto-boot */
 #define CONFIG_BAUDRATE		115200
 
 #define XMK_STR(x)	#x

include/configs/MPC8323ERDB.h

@@ -571,7 +571,7 @@
 #define CONFIG_FDTFILE		mpc832x_rdb.dtb
 
 #define CONFIG_LOADADDR		500000	/* default location for tftp and bootm */
-#define CONFIG_BOOTDELAY	-1	/* -1 disables auto-boot */
+#define CONFIG_BOOTDELAY	6	/* -1 disables auto-boot */
 #define CONFIG_BAUDRATE		115200
 
 #define XMK_STR(x)	#x

include/configs/MPC837XERDB.h

@@ -633,7 +633,7 @@
 #define CONFIG_FDTFILE		mpc8379_rdb.dtb
 
 #define CONFIG_LOADADDR		500000	/* default location for tftp and bootm */
-#define CONFIG_BOOTDELAY	-1	/* -1 disables auto-boot */
+#define CONFIG_BOOTDELAY	6	/* -1 disables auto-boot */
 #define CONFIG_BAUDRATE		115200
 
 #define XMK_STR(x)	#x