cfi-mtd: Add cfi-mtd driver.

Add cfi-mtd driver, which exports CFI flash to MTD layer.
This allows CFI flash devices to be used from MTD layer.

Building of the new driver is controlled by CONFIG_FLASH_CFI_MTD
option. Initialization is done by calling cfi_mtd_init() from
flash_init().

Signed-off-by: Piotr Ziecik <kosmo@semihalf.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/README b/README
index 9455fa7..861ea83 100644
--- a/README
+++ b/README
@@ -2157,6 +2157,11 @@
 		This option also enables the building of the cfi_flash driver
 		in the drivers directory
 
+- CONFIG_FLASH_CFI_MTD
+		This option enables the building of the cfi_mtd driver
+		in the drivers directory. The driver exports CFI flash
+		to the MTD layer.
+
 - CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 		Use buffered writes to flash.