fpga: ice40-spi: 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.
Acked-by: Xu Yilun <yilun.xu@intel.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/6a3ddedc955cf55dddbc68ccf5ff5e46af5e8b6f.1707324793.git.u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/fpga/ice40-spi.c

@@ -66,7 +66,7 @@ static int ice40_fpga_ops_write_init(struct fpga_manager *mgr,
 	}
 
 	/* Lock the bus, assert CRESET_B and SS_B and delay >200ns */
-	spi_bus_lock(dev->master);
+	spi_bus_lock(dev->controller);
 
 	gpiod_set_value(priv->reset, 1);
 
@@ -94,7 +94,7 @@ static int ice40_fpga_ops_write_init(struct fpga_manager *mgr,
 	ret = spi_sync_locked(dev, &message);
 
 fail:
-	spi_bus_unlock(dev->master);
+	spi_bus_unlock(dev->controller);
 
 	return ret;
 }