drm/i915/bdw: Take render error interrupt out of the mask

The handling of the error interrupts isn't wired up at all. And it
hasn't been ever since ilk happened, so don't bother.
Reviewed-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -2132,8 +2132,7 @@ int intel_init_vebox_ring_buffer(struct drm_device *dev)
 
 	if (INTEL_INFO(dev)->gen >= 8) {
 		ring->irq_enable_mask =
-			(GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT) |
-			GT_RENDER_CS_MASTER_ERROR_INTERRUPT;
+			GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT;
 		ring->irq_get = gen8_ring_get_irq;
 		ring->irq_put = gen8_ring_put_irq;
 		ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;