drm/i915/bdw: Do gen6 style reset for gen8

This patch existed before, but was lost over time.

Note that reset is still somewhat problematic in my limited testing (ie.
module_reload will not pass) but it can be disabled with a module
parameter, and support should be considered preliminary anyway.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_uncore.c

@@ -782,6 +782,7 @@ static int gen6_do_reset(struct drm_device *dev)
 int intel_gpu_reset(struct drm_device *dev)
 {
 	switch (INTEL_INFO(dev)->gen) {
+	case 8:
 	case 7:
 	case 6: return gen6_do_reset(dev);
 	case 5: return ironlake_do_reset(dev);