[Patch] bsp/tms570/sci: fix bug in tms570_sci_read_received_chars()

[Sebastian Huber]

Hello Adrien,

the change looks good. I would remove the 
tms570_sci_read_received_chars() and TMS570_SCI_BUFFER_SIZE:

static void tms570_sci_interrupt_handler(void * arg)
{
   rtems_termios_tty *tty = arg;
   tms570_sci_context *ctx = rtems_termios_get_device_context(tty);

   /*
    * Check if we have received something.
    */
   if ( (ctx->regs->FLR & TMS570_SCI_FLR_RXRDY ) == TMS570_SCI_FLR_RXRDY ) {
     char buf[1];

     buf[0] = ctx->regs->RD;
     rtems_termios_enqueue_raw_characters(tty, buf, 1);
   }
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