tegra: dts: Add cros-ec SPI settings

At present the interrupt does not work and the SPI bus runs much less
quickly than it should. Add settings to fix this.
Signed-off-by: NSimon Glass <sjg@chromium.org>

arch/arm/dts/tegra124-nyan-big-u-boot.dtsi

@@ -12,4 +12,13 @@
 			u-boot,dm-pre-reloc;
 		};
 	};
+
+	spi@7000d400 {
+		spi-deactivate-delay = <200>;
+		spi-max-frequency = <3000000>;
+
+		cros_ec: cros-ec@0 {
+			ec-interrupt = <&gpio TEGRA_GPIO(C, 7) GPIO_ACTIVE_LOW>;
+		};
+	};
 };