platform: add Radxa ROCK 3C platform support

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

include/arm/radxa_rock_3c.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_ROCK_3C_GPIO_COUNT 27
+#define MRAA_RADXA_ROCK_3C_I2C_COUNT  2
+#define MRAA_RADXA_ROCK_3C_SPI_COUNT  1
+#define MRAA_RADXA_ROCK_3C_UART_COUNT 5
+#define MRAA_RADXA_ROCK_3C_PWM_COUNT  7
+#define MRAA_RADXA_ROCK_3C_AIO_COUNT  0
+#define MRAA_RADXA_ROCK_3C_PIN_COUNT  40
+#define PLATFORM_NAME_RADXA_ROCK_3C   "Radxa ROCK3 Model C"
+
+mraa_board_t *
+        mraa_radxa_rock_3c();
+
+#ifdef __cplusplus
+}
+#endif