Nathan Hartman e67f72b02d stm32: lowputc: Ensure USART is disabled before configuring
arch/arm/src/stm32/stm32_lowputc.c:

    * stm32_lowsetup(): Ensure the USART is disabled before attempting
      to configure it because some register bits cannot be modified
      otherwise. This solves an issue that was encountered when a
      serial bootloader did not perform a full teardown/cleanup before
      launching NuttX.
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