kernel/acpi: Restore ACPI_DEBUG_{CACHE,LOCKS,MEMMAP} functionality.

Unfortunately we can't do this in acdragonfly.h alone since ACPICA
types such as ACPI_SIZE and so on are unavailable in acdragonfly.h.
This is because acpi.h includes acenv.h (and therefore acdragonfly.h)
before actypes.h.
kernel/acpi: Fix a x86_64 warning in the ACPI_DEBUG_MEMMAP code.