drm/i915: Wire up pipe CRC support for bdw

The layout of the CRC registers is the same as on hsw, only the
interrupt handling has changed a bit. So trivial to wire up, yay!
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -1808,6 +1808,9 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
 			intel_finish_page_flip_plane(dev, pipe);
 		}
 
+		if (pipe_iir & GEN8_PIPE_CDCLK_CRC_DONE)
+			hsw_pipe_crc_irq_handler(dev, pipe);
+
 		if (pipe_iir & GEN8_DE_PIPE_IRQ_FAULT_ERRORS) {
 			DRM_ERROR("Fault errors on pipe %c\n: 0x%08x",
 				  pipe_name(pipe),
@@ -2898,6 +2901,7 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 	struct drm_device *dev = dev_priv->dev;
 	uint32_t de_pipe_enables = GEN8_PIPE_FLIP_DONE |
 				   GEN8_PIPE_VBLANK |
+				   GEN8_PIPE_CDCLK_CRC_DONE |
 				   GEN8_DE_PIPE_IRQ_FAULT_ERRORS;
 	int pipe;
 	dev_priv->de_irq_mask[PIPE_A] = ~de_pipe_enables;