soc/nvidia: Get rid of device_t

Use of device_t has been abandoned in ramstage.

Change-Id: I065ed3a0deab2f59e510717f5d52beb2a62e900d
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26537
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/src/soc/nvidia/tegra210/dp.c b/src/soc/nvidia/tegra210/dp.c
index 119b4a7..848a314 100644
--- a/src/soc/nvidia/tegra210/dp.c
+++ b/src/soc/nvidia/tegra210/dp.c
@@ -1570,7 +1570,7 @@
 	return;
 }
 
-void dp_display_startup(device_t dev)
+void dp_display_startup(struct device *dev)
 {
 	struct soc_nvidia_tegra210_config *config = dev->chip_info;
 	struct display_controller *disp_ctrl =