platform: add Radxa CM5 IO platform support

Signed-off-by: Nascs <nascs@radxa.com>

include/arm/radxa_cm5_io.h

@@ -0,0 +1,30 @@
+/*
+ * Author: Nascs <nascs@radxa.com>
+ * Copyright (c) Radxa Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mraa_internal.h"
+
+#define MRAA_RADXA_CM5_IO_GPIO_COUNT 25
+#define MRAA_RADXA_CM5_IO_I2C_COUNT  4
+#define MRAA_RADXA_CM5_IO_SPI_COUNT  1
+#define MRAA_RADXA_CM5_IO_UART_COUNT 2
+#define MRAA_RADXA_CM5_IO_PWM_COUNT  7
+#define MRAA_RADXA_CM5_IO_AIO_COUNT  1
+#define MRAA_RADXA_CM5_IO_PIN_COUNT  40
+#define PLATFORM_NAME_RADXA_CM5_IO   "Radxa CM5 IO"
+
+mraa_board_t *
+        mraa_radxa_cm5_io();
+
+#ifdef __cplusplus
+}
+#endif