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the raspberry pi 4 has a new interrupt controller and
pci support, so get rid of intrenable() macro and
properly make intrenable function with tbdf argument.
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the raspi has two uarts, the pl011 and the mini. only one
can be used at a time due to pin muxing. the bcm kernel
uses the mini by default.
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the uartmini enable function used to override the baud
register so the effecive baudrate was always set to
115200 baud.
now the default baudrate of 9600 is set correctly and can
be changed in the console= boot parameter.
thanks aap and hiro for debugging, pizza and beer :)
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