tools: imximage: Fix the maximum DCD size for mx53/mx6

According to mx53 and mx6 reference manuals:

"The maximum size of the DCD limited to 1768 bytes."

As each DCD entry consists of 8 bytes, we have a total of 1768 / 8 = 221, and
excluding the first entry, which is the header leads to 220 as the maximum
number for DCD size.

Reported-by: Jonas Karlsson <jonas.d.karlsson@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Nitin Garg <nitin.garg@freescale.com>
Acked-by: Nitin Garg <nitin.garg@freescale.com>

tools/imximage.h

@@ -8,7 +8,7 @@
 #ifndef _IMXIMAGE_H_
 #define _IMXIMAGE_H_
 
-#define MAX_HW_CFG_SIZE_V2 121 /* Max number of registers imx can set for v2 */
+#define MAX_HW_CFG_SIZE_V2 220 /* Max number of registers imx can set for v2 */
 #define MAX_HW_CFG_SIZE_V1 60  /* Max number of registers imx can set for v1 */
 #define APP_CODE_BARKER	0xB1
 #define DCD_BARKER	0xB17219E9