[MTD] Export nand_write_raw

The previous _ecc removal / cleanup broke (i)nftl module usage.
Export the missing symbol.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index d796eb5..aa2e145 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1544,6 +1544,7 @@
 	nand_release_device(mtd);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(nand_write_raw);
 
 /**
  * nand_prepare_oobbuf - [GENERIC] Prepare the out of band buffer