mpc83xx: increase MONITOR_LEN to offset growing pains

Saving the environment leads to overwriting u-boot itself,
bricking boards.  Increase u-boot's image size so the environment
base address doesn't end up overlapping u-boot text.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MPC8349ITX.h b/include/configs/MPC8349ITX.h
index 9183d77..068df57 100644
--- a/include/configs/MPC8349ITX.h
+++ b/include/configs/MPC8349ITX.h
@@ -308,7 +308,7 @@
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
 /* CONFIG_SYS_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
-#define CONFIG_SYS_MONITOR_LEN		(256 * 1024) /* Reserve 256 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN		(384 * 1024) /* Reserve 384 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN		(128 * 1024) /* Reserved for malloc */
 
 /*