drm/i915: Forcing a modeset when resetting HDMI link

With fastboot enabled in gen9+ it broke the HDMI reset as just
setting mode_changed to true causes a fastset and here we want a full
modeset that will disable and then enable the encoder of this HDMI
link actually, so setting connectors_changed instead that will cause
modeset as desired.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190302003349.19189-3-jose.souza@intel.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -3973,7 +3973,7 @@ static int modeset_pipe(struct drm_crtc *crtc,
 		goto out;
 	}
 
-	crtc_state->mode_changed = true;
+	crtc_state->connectors_changed = true;
 
 	ret = drm_atomic_commit(state);
 out: