drm/tegra: Rename host1x_drm_context to tegra_drm_context

The structure represents a context associated with a particular process
that has opened the Tegra DRM device and requested a channel. This is a
very DRM-specific notion and has nothing to do with host1x. Rename the
structure to more clearly mark the boundaries between the two.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/host1x/drm/gr2d.c b/drivers/gpu/host1x/drm/gr2d.c
index 5f838b1..06507c8 100644
--- a/drivers/gpu/host1x/drm/gr2d.c
+++ b/drivers/gpu/host1x/drm/gr2d.c
@@ -58,7 +58,7 @@
 }
 
 static int gr2d_open_channel(struct host1x_client *client,
-			     struct host1x_drm_context *context)
+			     struct tegra_drm_context *context)
 {
 	struct gr2d *gr2d = to_gr2d(client);
 
@@ -70,7 +70,7 @@
 	return 0;
 }
 
-static void gr2d_close_channel(struct host1x_drm_context *context)
+static void gr2d_close_channel(struct tegra_drm_context *context)
 {
 	host1x_channel_put(context->channel);
 }
@@ -94,7 +94,7 @@
 	return &bo->base;
 }
 
-static int gr2d_submit(struct host1x_drm_context *context,
+static int gr2d_submit(struct tegra_drm_context *context,
 		       struct drm_tegra_submit *args, struct drm_device *drm,
 		       struct drm_file *file)
 {