mtd: spi-nor: Zap unneeded write_enable from write_reg

The 'write_enable' argument is unused and unneeded, so remove it from
the API.

Signed-off-by: Jagan Teki <jteki@openedev.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Han Xu <han.xu@freescale.com>
[Brian: fixed for nxp-spifi.c]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 6379e10..e9c912d 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -186,8 +186,7 @@
 	int (*write_xfer)(struct spi_nor *nor, struct spi_nor_xfer_cfg *cfg,
 			  u8 *buf, size_t len);
 	int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
-	int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len,
-			int write_enable);
+	int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
 
 	int (*read)(struct spi_nor *nor, loff_t from,
 			size_t len, size_t *retlen, u_char *read_buf);