gpu: host1x: Add MIPI pad calibration support

This driver adds support to perform calibration of the MIPI pads for CSI
and DSI.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index a61a976..0b6e8e9 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -306,4 +306,6 @@
 	host->debug_op->show_mlocks(host, o);
 }
 
+extern struct platform_driver tegra_mipi_driver;
+
 #endif