acpi: add build_append_named_dword, returning an offset in buffer
This is a very limited form of support for runtime patching - similar in functionality to what we can do with ACPI_EXTRACT macros in python, but implemented in C. This is to allow ACPI code direct access to data tables - which is exactly what DataTableRegion is there for, except no known windows release so far implements DataTableRegion. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NXiao Guangrong <guangrong.xiao@linux.intel.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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