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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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- calculate hardcoded constants for more clarity
- avoid unneccesary modification of cntpns ctl register
- revert enabling IRQcntpns for cpu0
- remove unused Localintpending register offset constant
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- disable local clock on interrupt to prevent accidents when reenabling
- always regitster local clock interrupt handler, even for cpu0
- simplify microdelay()
- don't mess with watchdog
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