powerpc/mpc85xx:Update MONITOR_LEN for 768KB u-boot size

U-boot binary size has been increased from 512KB to 768KB.

So update CONFIG_SYS_MONITOR_LEN to reflect the same.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/include/configs/p1_twr.h b/include/configs/p1_twr.h
index 97ec593..911203d 100644
--- a/include/configs/p1_twr.h
+++ b/include/configs/p1_twr.h
@@ -202,7 +202,7 @@
 					GENERATED_GBL_DATA_SIZE)
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
-#define CONFIG_SYS_MONITOR_LEN	(512 * 1024)/* Reserve 512 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN	(768 * 1024)
 #define CONFIG_SYS_MALLOC_LEN	(1024 * 1024)/* Reserved for malloc */
 
 #define CONFIG_SYS_BR0_PRELIM	CONFIG_FLASH_BR_PRELIM	/* NOR Base Address */