ItsEddy ced7d5a34f [DeviceDriver] stm32: Remove explicity clear of RXNE flag
According to STM32 Manual, the USART RXNE flag will be clear automatically after
read to the USART_DR register[1], so the call to USART_ClearITPendingBit is
unnecessary.

[1]: See RM0090 Reference Manual p.992, Bit 5
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