drm/i915: Allow VGA on CRTC 2

This is left over from the old PLL sharing code and isn't useful now
that PLLs are shared when possible.
Signed-off-by: NKeith Packard <keithp@keithp.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_crt.c

@@ -662,7 +662,7 @@ void intel_crt_init(struct drm_device *dev)
 	if (IS_HASWELL(dev))
 		crt->base.crtc_mask = (1 << 0);
 	else
-		crt->base.crtc_mask = (1 << 0) | (1 << 1);
+		crt->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
 
 	if (IS_GEN2(dev))
 		connector->interlace_allowed = 0;