[MTD] NAND modularize ECC

First step of modularizing ECC support.
- Move ECC related functionality into a seperate embedded data structure
- Get rid of the hardware dependend constants to simplify new ECC models

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
index d9a0143..d7f04ab 100644
--- a/drivers/mtd/nand/au1550nd.c
+++ b/drivers/mtd/nand/au1550nd.c
@@ -578,7 +578,7 @@
 
 	/* 30 us command delay time */
 	this->chip_delay = 30;
-	this->eccmode = NAND_ECC_SOFT;
+	this->ecc.mode = NAND_ECC_SOFT;
 
 	this->options = NAND_NO_AUTOINCR;