drm/meson: Fix CVBS VDAC disable

This commit fixes the VDAC disabling register write values.

Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

drivers/gpu/drm/meson/meson_venc_cvbs.c

@@ -167,7 +167,7 @@ static void meson_venc_cvbs_encoder_disable(struct drm_encoder *encoder)
 
 	/* Disable CVBS VDAC */
 	regmap_write(priv->hhi, HHI_VDAC_CNTL0, 0);
-	regmap_write(priv->hhi, HHI_VDAC_CNTL1, 0);
+	regmap_write(priv->hhi, HHI_VDAC_CNTL1, 8);
 }
 
 static void meson_venc_cvbs_encoder_enable(struct drm_encoder *encoder)