net: vertexcom: mse102x: Follow renaming of SPI "master" to "controller"

In commit 8caab75f ("spi: Generalize SPI "master" to "controller"")
some functions and struct members were renamed. To not break all drivers
compatibility macros were provided.

To be able to remove these compatibility macros push the renaming into
this driver.
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/feacee68c00f6f976c82864ba2f10a3f0c1b99f2.1707324794.git.u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/net/ethernet/vertexcom/mse102x.c

@@ -664,7 +664,7 @@ static int mse102x_probe_spi(struct spi_device *spi)
 	spi->bits_per_word = 8;
 	spi->mode |= SPI_MODE_3;
 	/* enforce minimum speed to ensure device functionality */
-	spi->master->min_speed_hz = MIN_FREQ_HZ;
+	spi->controller->min_speed_hz = MIN_FREQ_HZ;
 
 	if (!spi->max_speed_hz)
 		spi->max_speed_hz = MAX_FREQ_HZ;