Teach dnf about Elbrus2000 architecture

This is a follow-up for the RPM upstreaming efforts in
rpm-software-management/rpm#3899
and a prerequisite for
rpm-software-management/libdnf#1720

Author: arrowd

dnf/rpm/__init__.py

@@ -147,6 +147,7 @@ def _invert(dct):
     'sparc': ('sparc', 'sparc64', 'sparc64v', 'sparcv8', 'sparcv9',
               'sparcv9v'),
     'x86_64': ('x86_64', 'amd64', 'ia32e'),
+    'e2k': ('e2k', 'e2kv4', 'e2kv5', 'e2kv6'),
 })