boards: add spi support for kit_pse84_eval_m33

- add spi to supported in board yaml file
- add spi_loopback test overlay

Signed-off-by: McAtee Maxwell <maxwell.mcatee@infineon.com>
diff --git a/boards/infineon/kit_pse84_eval/kit_pse84_eval_m33.yaml b/boards/infineon/kit_pse84_eval/kit_pse84_eval_m33.yaml
index 6098c98..d91137e 100644
--- a/boards/infineon/kit_pse84_eval/kit_pse84_eval_m33.yaml
+++ b/boards/infineon/kit_pse84_eval/kit_pse84_eval_m33.yaml
@@ -16,3 +16,4 @@
   - gpio
   - pin_ctrl
   - uart
+  - spi
diff --git a/tests/drivers/spi/spi_loopback/boards/kit_pse84_eval_pse846gps2dbzc4a_m33.overlay b/tests/drivers/spi/spi_loopback/boards/kit_pse84_eval_pse846gps2dbzc4a_m33.overlay
new file mode 100644
index 0000000..533ab38
--- /dev/null
+++ b/tests/drivers/spi/spi_loopback/boards/kit_pse84_eval_pse846gps2dbzc4a_m33.overlay
@@ -0,0 +1,8 @@
+/*
+ * Copyright (c) 2025 Infineon Technologies AG,
+ * or an affiliate of Infineon Technologies AG.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "kit_pse84_eval_common.overlay"