Interrupt related cleanups:

o  Assign vectors based on priority, because vectors have
   implied priority in hardware.
o  Use unordered memory accesses to the I/O sapic and use
   the acceptance form of the mf instruction.
o  Remove the sapicreg.h and sapicvar.h headers. All definitions
   in sapicreg.h are private to sapic.c and all definitions in
   sapicvar.h are either private or interface functions. Move the
   interface functions to intr.h.
o  Hide the definition of struct sapic.

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