spi: spi-mem: Fix a typo in the documentation of struct spi_mem

Fix a typo in the @drvpriv description.
Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de>
Acked-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/linux/spi/spi-mem.h

@@ -122,7 +122,7 @@ struct spi_mem_op {
 /**
  * struct spi_mem - describes a SPI memory device
  * @spi: the underlying SPI device
- * @drvpriv: spi_mem_drviver private data
+ * @drvpriv: spi_mem_driver private data
  *
  * Extra information that describe the SPI memory device and may be needed by
  * the controller to properly handle this device should be placed here.