tests: drivers: spi: Add configs and dts node for ek_ra4l1

# Copyright (c) 2025 Renesas Electronics Corporation

# SPDX-License-Identifier: Apache-2.0

CONFIG_SPI_LOOPBACK_MODE_LOOP=y

CONFIG_SPI_INTERRUPT=y

CONFIG_SPI_RA_DTC=y

/*

 * Copyright (c) 2025 Renesas Electronics Corporation

 * SPDX-License-Identifier: Apache-2.0

 */

&spi0 {

	rx-dtc;

	tx-dtc;

	slow@0 {

		compatible = "test-spi-loopback-slow";

		reg = <0>;

		spi-max-frequency = <2000000>;

	};

	fast@0 {

		compatible = "test-spi-loopback-fast";

		reg = <0>;

		spi-max-frequency = <3000000>;

	};

};