Always update the hw.uart.console hint anytime a change is made to the comconsole setup.  Previously the hint would be set when if you set a custom port, but it would not be updated if you later set a custom speed.
Always update the hw.uart.console hint anytime a change is made to the
comconsole setup.  Previously the hint would be set when if you set a
custom port, but it would not be updated if you later set a custom speed.

Also, leave the hw.uart.console hint mutable so it can be overridden or
unset by the user if needed.

Reviewed by:	kib (earlier version)
MFC after:	1 week

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