spi: tegra114_spi: Convert to use spi_alloc_slave()

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Marek Vasut <marex@denx.de>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
diff --git a/drivers/spi/tegra114_spi.c b/drivers/spi/tegra114_spi.c
index b11a0a1..4d2af48 100644
--- a/drivers/spi/tegra114_spi.c
+++ b/drivers/spi/tegra114_spi.c
@@ -152,13 +152,11 @@
 		return NULL;
 	}
 
-	spi = malloc(sizeof(struct tegra_spi_slave));
+	spi = spi_alloc_slave(struct tegra_spi_slave, bus, cs);
 	if (!spi) {
 		printf("SPI error: malloc of SPI structure failed\n");
 		return NULL;
 	}
-	spi->slave.bus = bus;
-	spi->slave.cs = cs;
 	spi->ctrl = &spi_ctrls[bus];
 	if (!spi->ctrl) {
 		printf("SPI error: could not find controller for bus %d\n",