xmc/tests: Add test_config.h and update arduino-core-tests submodule.

Signed-off-by: Frederikwag <frederik.wagner@infineon.com>

Author: Frederikwag

tests/arduino-core-tests

@@ -0,0 +1,19 @@
+/**
+ * @file test_config.h
+ * @brief Configuration file for board-specific test pin definitions.
+ *
+ * This header file contains the definitions of the pins used for testing
+ * purposes on the specific board. These pins are configured as output and
+ * input pins for various test scenarios.
+ *
+ */
+#ifndef TEST_CONFIG_H
+#define TEST_CONFIG_H
+
+#include <stdint.h>
+
+// test defines
+const uint8_t TEST_DIGITALIO_OUTPUT = 7; // IO0
+const uint8_t TEST_DIGITALIO_INPUT = 8;  // IO1
+
+#endif // TEST_CONFIG_H