SELFOUR-607: inline remaining irq path functions

SELFOUR-519: remove duplicated constants

* rename physBaseMapping to BASE_OFFSET
* because physBaseMapping was only used explicity in a few places
* move duplicated arm definions up a level
- PPTR_TOP
- PADDR_TOP
- BASE_OFFSET

Refactor duplicated code in hardware.h

One copy to rule them all.

Release snapshot