arm64: dts: renesas: ulcb-kf: Adapt 1.8V HDMI regulator to schematics

It is named T1.8V in the schematics. Also add properties documenting it
is always on, also during boot.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240129212350.33370-2-wsa+renesas@sang-engineering.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/ulcb-kf.dtsi

@@ -32,11 +32,13 @@ hdmi1_con: endpoint {
 		};
 	};
 
-	hdmi_1v8: regulator-hdmi-1v8 {
+	reg_t1p8v: regulator-t1p8v {
 		compatible = "regulator-fixed";
-		regulator-name = "hdmi-1v8";
+		regulator-name = "T1.8V";
 		regulator-min-microvolt = <1800000>;
 		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+		regulator-always-on;
 	};
 
 	pcie_1v5: regulator-pcie-1v5 {
@@ -154,11 +156,11 @@ hdmi@3d {
 
 				pd-gpios = <&gpio_exp_75 5 GPIO_ACTIVE_LOW>;
 
-				avdd-supply = <&hdmi_1v8>;
-				dvdd-supply = <&hdmi_1v8>;
-				pvdd-supply = <&hdmi_1v8>;
+				avdd-supply = <&reg_t1p8v>;
+				dvdd-supply = <&reg_t1p8v>;
+				pvdd-supply = <&reg_t1p8v>;
 				dvdd-3v-supply = <&reg_3p3v>;
-				bgvdd-supply = <&hdmi_1v8>;
+				bgvdd-supply = <&reg_t1p8v>;
 
 				adi,input-depth = <8>;
 				adi,input-colorspace = "rgb";