Lots of small fixes and I merged the PCI subsystem with i386 again
because it was mostly identical. This makes the patch quite big,
but it only removes files.

 - Merge PCI subsystem with i386.

   This changes the initialization order of PCI and IOMMU slightly.  It
   didn't see any problems yet, but it could cause some in theory.  It
   re-adds some code that used to be removed, but it's only small stuff
   and it should hopefully cause less mainteance overhead longer term.

 - Fix warnings
 - Merge cpuid.c with i386.c
 - Sync msr.c with i386
 - Consolidate externs in asm/proto.h
 - sysfs/sysdev fixes for apic/nmi (Bryan O'Sullivan)
 - Fix /proc/kcore access
 - Add real kern_addr_valid (used for above).
 - Support consistent dma_mask in IOMMU
 - Fix double print of AMD for CPU model.
 - Remove unused wakeup.S file.
 - Remove obsolete CONFIG_SIMNOW ifdef.
 - Support ptrace access for 32bit vsyscalls.
 - Fix warnings in 32bit boot code compilation.