drm/meson: add support for HDMI2.0 2160p modes

Now we support the TMDS Clock > 3.4GHz and support the SCDC Control
operation in the DW-HDMI Controller, we can enable support for the
HDMI2.0 3840x2160@60/50 RGB444 display modes.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1549022873-40549-4-git-send-email-narmstrong@baylibre.com

drivers/gpu/drm/meson/meson_venc.c

@@ -848,6 +848,8 @@ struct meson_hdmi_venc_vic_mode {
 	{ 93, &meson_hdmi_encp_mode_2160p24 },
 	{ 94, &meson_hdmi_encp_mode_2160p25 },
 	{ 95, &meson_hdmi_encp_mode_2160p30 },
+	{ 96, &meson_hdmi_encp_mode_2160p25 },
+	{ 97, &meson_hdmi_encp_mode_2160p30 },
 	{ 0, NULL}, /* sentinel */
 };