hw/arm/virt: Add nvdimm hot-plug infrastructure

hw/arm/virt: Add nvdimm hot-plug infrastructure

This adds support to init nvdimm acpi state and build nvdimm acpi tables.
Please note nvdimm_support is not yet enabled.

Signed-off-by: Kwangwoo Lee <[email protected]>
Signed-off-by: Eric Auger <[email protected]>
Signed-off-by: Shameer Kolothum <[email protected]>
Reviewed-by: Igor Mammedov <[email protected]>
Message-Id: <20200421125934[email protected]>
Acked-by: Peter Maydell <[email protected]>
Tested-by: Eric Auger <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>