pc: acpi: use environment provided preprocessor instead of hardcoded one

that will allow to switch from clang preprocessor to gcc one,
since the former refuses to handle ASL files.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
fixup! pc: initialize memory hotplug address space

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
fixup! pc: add memory hotplug handler to PC_MACHINE

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
fixup! pc: implement pc-dimm device abstraction

Signed-off-by: Igor Mammedov <imammedo@redhat.com>