lpc2000: fix LPC810 programming support

IAP commands fail on programming LPC810 because it has only 1kByte of SRAM.
This patch is fixing cmd51_max_buffer suitable size for LPC810,LPC811 and
other LPC1000 series.
Tested on a LPC810,LPC812,LPC11u14,and LPC1114(DIP28).

Change-Id: Iecec9fd963cb63bdff4a7bd3bbf4f8b1a7c60fbd
Signed-off-by: Nemui Trinomius <nemuisan_kawausogasuki@live.jp>
Reviewed-on: http://openocd.zylin.com/1843


Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/flash/nor/lpc2000.c

@@ -60,11 +60,11 @@
  * - 176x (tested with LPC1768)
  *
  * lpc4300 (also available as lpc1800 - alias)
- * - 43x2 | 3 | 5 | 7 (tested with 4337)
+ * - 43x2 | 3 | 5 | 7 (tested with LPC4337/LPC4357)
  * - 18x2 | 3 | 5 | 7
  *
  * lpc800:
- * - 810 | 1 | 2 (tested with 812)
+ * - 810 | 1 | 2 (tested with LPC810/LPC812)
  */
 
 typedef enum {
@@ -230,15 +230,15 @@ static int lpc2000_build_sector_list(struct flash_bank *bank)
 	} else if (lpc2000_info->variant == lpc1700) {
 		switch (bank->size) {
 			case 4 * 1024:
-				lpc2000_info->cmd51_max_buffer = 1024;
+				lpc2000_info->cmd51_max_buffer = 256;
 				bank->num_sectors = 1;
 				break;
 			case 8 * 1024:
-				lpc2000_info->cmd51_max_buffer = 1024;
+				lpc2000_info->cmd51_max_buffer = 512;
 				bank->num_sectors = 2;
 				break;
 			case 16 * 1024:
-				lpc2000_info->cmd51_max_buffer = 1024;
+				lpc2000_info->cmd51_max_buffer = 512;
 				bank->num_sectors = 4;
 				break;
 			case 32 * 1024:
@@ -303,9 +303,11 @@ static int lpc2000_build_sector_list(struct flash_bank *bank)
 			lpc2000_info->cmd51_max_buffer = 1024;
 		switch (bank->size) {
 			case 4 * 1024:
+				lpc2000_info->cmd51_max_buffer = 256;
 				bank->num_sectors = 4;
 				break;
 			case 8 * 1024:
+				lpc2000_info->cmd51_max_buffer = 512;
 				bank->num_sectors = 8;
 				break;
 			case 16 * 1024: