Make it compile again and various cleanups and a few bug fixes.  Only
changes x86-64 specific files.

Most of it are S3 suspend changes from Pavel and comment spelling fixes
from Steven Cole.

- Remove now obsolete check_cpu function
- Fix sys_ioctl prototype
- Small optimization - use SYSCALL for 32bit signal handling.
- Fix S3 suspend handling and split into individual files like i386 (Pavel)
- Merge from i386 (pci fixes etc.)
- Set correct paging attributes for IOMMU aperture
- Fix disable apic option