tests: dma: microchip: Add board overlay file

Add board overlay file for pic32cx_sg41_cult to enable dma
test cases to run on this board

Signed-off-by: Arunprasath P <arunprasath.p@microchip.com>

Author: ArunMCHP

tests/drivers/dma/chan_blen_transfer/boards/pic32cx_sg41_cult.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2025 Microchip Technology Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+tst_dma0: &dmac {
+	status = "okay";
+};

tests/drivers/dma/loop_transfer/boards/pic32cx_sg41_cult.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2025 Microchip Technology Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+tst_dma0: &dmac {
+	status = "okay";
+};