tegra114: dalmore: fdt: enable dalmore SPI controller

Dalmore has a SPI flash part attached to controller 4, so enable
controller 4 and set to 25MHz.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>

board/nvidia/dts/tegra114-dalmore.dts

@@ -43,4 +43,9 @@
 		status = "okay";
 		clock-frequency = <400000>;
 	};
+
+	spi@7000da00 {
+		status = "okay";
+		spi-max-frequency = <25000000>;
+	};
 };