ieee802154: ca8210: 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: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
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/dec96b1d3cf43bb442128957b27d02007ffeb68d.1707324794.git.u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/net/ieee802154/ca8210.c

@@ -2956,7 +2956,7 @@ static int ca8210_test_interface_init(struct ca8210_priv *priv)
 		node_name,
 		sizeof(node_name),
 		"ca8210@%d_%d",
-		priv->spi->master->bus_num,
+		priv->spi->controller->bus_num,
 		spi_get_chipselect(priv->spi, 0)
 	);