This is the barebox adoption of the linux v4.16 patch

  4120f8d
  Author:     Boris Brezillon <bbrezillon@kernel.org>
  AuthorDate: Thu Apr 26 18:18:19 2018 +0200
  Commit:     Mark Brown <broonie@kernel.org>
  CommitDate: Fri May 11 11:33:51 2018 +0900

  mtd: spi-nor: Use the spi_mem_xx() API

  The spi_mem_xxx() API has been introduced to replace the
  spi_flash_read() one. Make use of it so we can get rid of
  spi_flash_read().

  Note that using spi_mem_xx() also simplifies the code because this API
  takes care of using the regular spi_sync() interface when the optimized
  ->mem_ops interface is not implemented by the controller.

  Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
  Reviewed-by: Frieder Schrempf <frieder.schrempf@exceet.de>
  Tested-by: Frieder Schrempf <frieder.schrempf@exceet.de>
  Signed-off-by: Mark Brown <broonie@kernel.org>

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