tpiu: bitfield ACPR, verify set_swo_baud_rate args and ops
          #389
        
          
      
      
        
          +51
        
        
          −4
        
        
          
        
      
    
  
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Draft improvement that closes #388.
At this point we might as well implement a
TPIU::configureakin to{DWT,ITM}::configure. Other register functions will have to be reviewed to see if any other errors can be caught. We should also checkswo_supportsto see if a non-zero prescaler is supported at all.