support avr architecture based on ATMega32

1. IAR project, see TencentOS-tiny\board\ATMega32\IAR, both 4.12 and 7.20 is supplied.

board/ATMega32/BSP/src/hal_uart.c

@@ -0,0 +1,20 @@
+#if 0
+
+#include "tos_hal.h"
+
+int tos_hal_uart_init(hal_uart_t *uart, hal_uart_port_t port)
+{
+
+}
+
+int tos_hal_uart_write(hal_uart_t *uart, const uint8_t *buf, size_t size, uint32_t timeout)
+{
+    int i = 0;
+
+    for (i = 0; i < size; ++i) {
+        uart_send_byte(buf[i]);
+    }
+}
+
+
+#endif