drm/i915: Set display_mmio_offset for VLV

This will cause display registers to include the correct
offset on VLV.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 3ff8e73..521a253 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -276,6 +276,7 @@
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.is_valleyview = 1,
+	.display_mmio_offset = VLV_DISPLAY_BASE,
 };
 
 static const struct intel_device_info intel_valleyview_d_info = {
@@ -285,6 +286,7 @@
 	.has_bsd_ring = 1,
 	.has_blt_ring = 1,
 	.is_valleyview = 1,
+	.display_mmio_offset = VLV_DISPLAY_BASE,
 };
 
 static const struct intel_device_info intel_haswell_d_info = {