Use disable-bt overlay with raspberry pi so the pl011 will be used as

console uart instead of the 'mini uart' a quirky 8250 alike which
lacks flow control and break detection.  By default the pl011 is used
for bluetooth.  The pins the console is on do not change.

When com(4) takes over the console with the mini uart on rpi3 I see
noise before output resumes and can't interact with the console after it
has booted.  With pluart(4) as console everything is fine.

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