Based on the Linux v4.2 commit:

  commit f9f3ce8
  Author:     Jagan Teki <jteki@openedev.com>
  AuthorDate: Wed Aug 19 15:26:44 2015 +0530
  Commit:     Brian Norris <computersforpeace@gmail.com>
  CommitDate: Fri Sep 11 16:04:55 2015 -0700

      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>

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>