[PATCH] bsps/riscv/riscv: Fix fe310_uart_read

[Sebastian Huber]

On 18/09/2022 21:22, Alan Cudmore wrote:
> Note: Resending after learning how to use git send-email, please disregard previous message.
> 
> This fixes the riscv fe310 console driver fe310_uart_read function. The function
> reads the RX status/data register to check if data is available, but discards
> the data and reads it a seconds time.
> Also cleared the interrupt enable bit in the first_open function.
> 
> Close #4719

Thanks, I checked it in.

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