spl: add NAND Library to new SPL

Adds NAND library to SPL.

Signed-off-by: Simon Schwarz <simonschwarzcor@gmail.com>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/doc/README.SPL b/doc/README.SPL
index 30624a5..057360e 100644
--- a/doc/README.SPL
+++ b/doc/README.SPL
@@ -60,3 +60,4 @@
 CONFIG_SPL_SPI_SUPPORT (drivers/spi/libspi.o)
 CONFIG_SPL_FAT_SUPPORT (fs/fat/libfat.o)
 CONFIG_SPL_LIBGENERIC_SUPPORT (lib/libgeneric.o)
+CONFIG_SPL_NAND_SUPPORT (drivers/mtd/nand/libnand.o)