Add debug message.

  * i386/i386at/acpi/boot.c(checksum): Add debug message.
Avoid to overwrite ACPI reclaim zone.

  * i386/i386at/model_dep.c(init_alloc_aligned): Avoid to overwrite ACPI
                                                 reclaim zone.
  * i386/include/mach/i386/multiboot.h: Add other mmap types.
Use phystokv to correct memory mapping.

  * i386/i386at/acpi/boot.c: Use phystokv to correct memory mapping.