arm64: dts: meson-gx: add hhi reg entry to hdmi_tx

There's no reliable way to reuse the hhi entry from the vpu as is done
in the linux kernel, so we duplicate it here.

We will be able to sync against kernel DTS in the future when the VPU
gets based on the clock framework rather than the HHI reg.

Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/dts/meson-gx-u-boot.dtsi b/arch/arm/dts/meson-gx-u-boot.dtsi
index 868a573..b84e5ed 100644
--- a/arch/arm/dts/meson-gx-u-boot.dtsi
+++ b/arch/arm/dts/meson-gx-u-boot.dtsi
@@ -13,3 +13,9 @@
 &vpu {
 	u-boot,dm-pre-reloc;
 };
+
+&hdmi_tx {
+	reg = <0x0 0xc883a000 0x0 0x1c>,
+	      <0x0 0xc883c000 0x0 0x1000>;
+	reg-names = "hdmitx", "hhi";
+};