bcm963158: remove CONFIG_SYS_NAND_DRIVER_ECC_LAYOUT

This board define the flag CONFIG_SYS_NAND_DRIVER_ECC_LAYOUT
but it's a mistake. It's a workaround for an issue in nand core.
This issue was fixed by the commit 5f626e78491c ("mtd: nand: raw:
Fix CONFIG_SYS_NAND_DRIVER_ECC_LAYOUT behavior"). Now, this flag
break the nand on this board, so we simply remove it.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/include/configs/broadcom_bcm963158.h b/include/configs/broadcom_bcm963158.h
index 2de6f21..a0f7ead 100644
--- a/include/configs/broadcom_bcm963158.h
+++ b/include/configs/broadcom_bcm963158.h
@@ -34,7 +34,6 @@
 #define CONFIG_SYS_MAX_NAND_DEVICE	1
 #define CONFIG_SYS_NAND_SELF_INIT
 #define CONFIG_SYS_NAND_ONFI_DETECTION
-#define CONFIG_SYS_NAND_DRIVER_ECC_LAYOUT
 #endif /* CONFIG_NAND */
 
 /*