split rootfs-part once again -

having a smaller rootfs reduces mount time which reduces boot time.

Warning: Now we have to ensure, that anything which is accessing the new
data partition, has to get delayed until the data partition got mounted

target/linux/xburst/files-2.6.32/arch/mips/jz4740/board-qi_lb60.c

@@ -94,7 +94,11 @@ static struct mtd_partition qi_lb60_partitions_2gb[] = {
  	},
 	{ .name = "NAND ROOTFS partition",
 	  .offset = 8 * 0x100000,
-	  .size = (504 + 512 + 1024) * 0x100000,
+      .size = 256 * 0x100000,
+ 	},
+    { .name = "NAND DATA partition",
+      .offset = 264 * 0x100000,
+      .size = 1784 * 0x100000,
     },
 };