boards: esp32c6_devkitc: Test files for DMA and UART async

Test files for DMA and UART async

Signed-off-by: Raffael Rostagno <[email protected]>

tests/drivers/dma/loop_transfer/boards/esp32c6_devkitc.conf

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+CONFIG_DMA_LOOP_TRANSFER_CHANNEL_NR=4
+CONFIG_DMA_LOOP_TRANSFER_SIZE=4094

tests/drivers/dma/loop_transfer/boards/esp32c6_devkitc.overlay

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+/*
+ * Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&dma {
+	status = "okay";
+};
+
+tst_dma0: &dma { };

tests/drivers/uart/uart_async_api/boards/esp32c6_devkitc.conf

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+CONFIG_HEAP_MEM_POOL_SIZE=32768
+CONFIG_DMA=y

tests/drivers/uart/uart_async_api/boards/esp32c6_devkitc.overlay

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+/*
+ * Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	uart1_test: uart1_test {
+		group1 {
+			pinmux = <UART1_TX_GPIO2>;
+			input-enable;   /* Connect GPIO2 and GPIO3 externally for testing */
+		};
+		group2 {
+			pinmux = <UART1_RX_GPIO3>;
+			output-enable;  /* Connect GPIO2 and GPIO3 externally for testing */
+		};
+	};
+};
+
+dut: &uart1 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart1_test>;
+	pinctrl-names = "default";
+	dmas = <&dma 0>, <&dma 1>;
+	dma-names = "rx", "tx";
+};
+
+&dma {
+	status = "okay";
+};