[nrf fromtree] tests: drivers: spi: Add configuration for SPI test on RX130

Add device tree overlay for spi test on RSKRX130 board

Signed-off-by: Duy Nguyen <[email protected]>
(cherry picked from commit 9e5aa82)

Author: duynguyenxa

tests/drivers/spi/spi_loopback/boards/rsk_rx130_512kb.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&rspi0 {
+	slow@0 {
+		compatible = "test-spi-loopback-slow";
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+	};
+	fast@0 {
+		compatible = "test-spi-loopback-fast";
+		reg = <0>;
+		spi-max-frequency = <3000000>;
+	};
+};