[Fix] <bsp>:bsp/gd32/arm/libraries/gd32_drivers/drv_usart.c 函数gd32_uart_gpio_init 过早开中断触发断言rx_fifo == NULL

[illustriousness]

Solution: gd32_uart_gpio_init 不开中断
等驱动框架初始化好fifo后通过 device_control 开中断
以下是drv_usart.c 中注册进驱动框架的 device_control 函数

static rt_err_t gd32_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
    struct gd32_uart *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct gd32_uart *)serial->parent.user_data;

    switch (cmd)
    {
    case RT_DEVICE_CTRL_CLR_INT:
        /* disable rx irq */
        NVIC_DisableIRQ(uart->irqn);
        /* disable interrupt */
        usart_interrupt_disable(uart->uart_periph, USART_INT_RBNE);

        break;
    case RT_DEVICE_CTRL_SET_INT:
        /* enable rx irq */
        NVIC_EnableIRQ(uart->irqn);
        /* enable interrupt */
        usart_interrupt_enable(uart->uart_periph, USART_INT_RBNE);
        break;
    }

    return RT_EOK;
}

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