arm64: dts: renesas: falcon-cpu: Use INTC_EX for SN65DSI86

The INTC block is a better choice for handling the interrupts on the V3U
as the INTC will always be powered, while the GPIO block may be
de-clocked if not in use. Further more, it may be likely to have a lower
power consumption as it does not need to drive the pins.

Switch the interrupt parent and interrupts definition from gpio1 to
irq0 on intc_ex, and configure the PFC accordingly.
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20220309190631.1576372-1-kieran.bingham+renesas@ideasonboard.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a779a0-falcon-cpu.dtsi

@@ -192,14 +192,17 @@ &i2c1 {
 	clock-frequency = <400000>;
 
 	bridge@2c {
+		pinctrl-0 = <&irq0_pins>;
+		pinctrl-names = "default";
+
 		compatible = "ti,sn65dsi86";
 		reg = <0x2c>;
 
 		clocks = <&sn65dsi86_refclk>;
 		clock-names = "refclk";
 
-		interrupt-parent = <&gpio1>;
-		interrupts = <24 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-parent = <&intc_ex>;
+		interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
 
 		vccio-supply = <&reg_1p8v>;
 		vpll-supply = <&reg_1p8v>;
@@ -271,6 +274,11 @@ i2c6_pins: i2c6 {
 		function = "i2c6";
 	};
 
+	irq0_pins: irq0 {
+		groups = "intc_ex_irq0";
+		function = "intc_ex";
+	};
+
 	keys_pins: keys {
 		pins = "GP_6_18", "GP_6_19", "GP_6_20";
 		bias-pull-up;