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/MPC8349EMDS.h b/include/configs/MPC8349EMDS.h
index ea5fbff..63c6dbc 100644
--- a/include/configs/MPC8349EMDS.h
+++ b/include/configs/MPC8349EMDS.h
@@ -201,7 +201,7 @@
 #define CONFIG_SYS_GBL_DATA_OFFSET	(CONFIG_SYS_INIT_RAM_END - CONFIG_SYS_GBL_DATA_SIZE)
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
-#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 */
 
 /*