drm/i915/ringbuffer: Mark the initialisation structs as constant.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 478406d..f0b44d3 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -792,7 +792,7 @@
 	intel_ring_advance(dev, ring);
 }
 
-static struct intel_ring_buffer render_ring = {
+static const struct intel_ring_buffer render_ring = {
 	.name			= "render ring",
 	.id			= RING_RENDER,
 	.regs                   = {
@@ -830,7 +830,7 @@
 
 /* ring buffer for bit-stream decoder */
 
-static struct intel_ring_buffer bsd_ring = {
+static const struct intel_ring_buffer bsd_ring = {
 	.name                   = "bsd ring",
 	.id			= RING_BSD,
 	.regs			= {
@@ -948,7 +948,7 @@
 }
 
 /* ring buffer for Video Codec for Gen6+ */
-static struct intel_ring_buffer gen6_bsd_ring = {
+static const struct intel_ring_buffer gen6_bsd_ring = {
        .name			= "gen6 bsd ring",
        .id			= RING_BSD,
        .regs			= {