tests: drivers: spi: spi_loopback: Support RTIO tests for APARD32690

Add overlay for APARD32690 board and add a new test case to
test RTIO functionalities of SPI MAX32 driver.

Signed-off-by: Dimitrije Lilic <dimitrije.lilic@orioninc.com>

tests/drivers/spi/spi_loopback/boards/apard32690_max32690_m4.overlay

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2024 Analog Devices, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+arduino_spi: &spi1 {
+	status = "okay";
+	slow@0 {
+		compatible = "test-spi-loopback-slow";
+		reg = <0>;
+		spi-max-frequency = <128000>;
+	};
+	fast@0 {
+		compatible = "test-spi-loopback-fast";
+		reg = <0>;
+		spi-max-frequency = <500000>;
+	};
+};

tests/drivers/spi/spi_loopback/overlay-max32-spi-rtio.conf

@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2024 Analog Devices, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+CONFIG_SPI_RTIO=y
+CONFIG_SPI_ASYNC=n

tests/drivers/spi/spi_loopback/testcase.yaml

@@ -210,3 +210,9 @@ tests:
     platform_allow:
       - s32z2xxdc2/s32z270/rtu0
       - s32z2xxdc2/s32z270/rtu1
+  drivers.spi.max32_spi_rtio.loopback:
+    extra_args:
+      - OVERLAY_CONFIG="overlay-max32-spi-rtio.conf"
+    filter: CONFIG_SOC_FAMILY_MAX32
+    platform_allow:
+      - apard32690/max32690/m4