drm/i915: Set initial seqno value close to wrap boundary

To gain confidence in the wrap handling, make it happen quite
soon after the boot.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem.c

@@ -3943,7 +3943,7 @@ i915_gem_init_hw(struct drm_device *dev)
 			goto cleanup_bsd_ring;
 	}
 
-	dev_priv->next_seqno = 1;
+	dev_priv->next_seqno = (u32)-1 - 0x1000;
 
 	/*
 	 * XXX: There was some w/a described somewhere suggesting loading