drm/tegra: Use DRIVER level for IOMMU aperture message

This allows the message to be shown even if core messages are disabled
globally in DRM.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index ced5a09..d9a0925 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -137,8 +137,8 @@
 		start = geometry->aperture_start;
 		end = geometry->aperture_end;
 
-		DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
-			  start, end);
+		DRM_DEBUG_DRIVER("IOMMU aperture initialized (%#llx-%#llx)\n",
+				 start, end);
 		drm_mm_init(&tegra->mm, start, end - start + 1);
 	}