README: Drop unused JFFS2 options

There appear to be neither implemented nor used. Drop them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/doc/README.JFFS2_NAND b/doc/README.JFFS2_NAND
index 09788d5..92fa0f6 100644
--- a/doc/README.JFFS2_NAND
+++ b/doc/README.JFFS2_NAND
@@ -2,23 +2,7 @@
 
 To enable, use the following #define in the board configuration file:
 
-#define CONFIG_JFFS2_NAND 1
+#define CONFIG_JFFS2_NAND
 
 Configuration of partitions is similar to how this is done in  U-Boot
-for  JFFS2  on top NOR flash. If a single partition is used, it can be
-configured using the following #defines in the configuration file:
-
-#define CONFIG_JFFS2_NAND_DEV 0			/* nand device jffs2 lives on */
-#define CONFIG_JFFS2_NAND_OFF 0			/* start of jffs2 partition */
-#define CONFIG_JFFS2_NAND_SIZE 2*1024*1024	/* size of jffs2 partition */
-
-If more than a single partition is desired, the user can define a
-CONFIG_SYS_JFFS_CUSTOM_PART macro and implement a
-
-	struct part_info* jffs2_part_info(int part_num)
-
-function in a board-specific module. An example of such function is
-available in common/cmd_jffs2.c
-
-The default configuration for the DAVE board has a single JFFS2
-partition of 2 MB size.
+for  JFFS2  on top NOR flash.