nova: drop dmidecode

It's basically noop since dmidecode is in libvirt deps
in all distributions for a long time.

Change-Id: I48251e0a96f22a3ca6e1cc2523b81e3e1aa1ae71

Author: mnasiadka

docker/nova/nova-libvirt/Dockerfile.j2

@@ -76,12 +76,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         {% endif %}
     {% endif %}
 
-    {% if base_arch in ['aarch64', 'x86_64'] %}
-        {% set nova_libvirt_packages = nova_libvirt_packages + [
-            'dmidecode'
-        ] %}
-    {% endif %}
-
     {% if base_distro in ['debian'] %}
         {% set nova_libvirt_packages = nova_libvirt_packages + [
             'usermode'