board/t1040qds: Fix typo in t1040_pbi.cfg file

T1040QDS has 256KB SRAM. Comment is showing wrong information.

So update the comment.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>

board/freescale/t1040qds/t1040_pbi.cfg

@@ -3,7 +3,7 @@
 09010000 00200400
 09138000 00000000
 091380c0 00000100
-#Configure CPC1 as 512KB SRAM
+#Configure CPC1 as 256KB SRAM
 09010100 00000000
 09010104 fffc0007
 09010f00 08000000