Add new extension qemu-kiwi

This adds qemu-kiwi as another extension to the list. 
The qemu-kiwi extension is added to MCO with this PR openshift/machine-config-operator#2376
qemu-kiwi is a shrunk-down version of the qemu-kvm package with fewer dependencies. 8 rpms and ~20MB in size when installed

extensions.yaml

@@ -33,3 +33,17 @@ extensions:
       - kernel-rt-modules
       - kernel-rt-modules-extra
       - kernel-rt-devel
+  # https://github.com/openshift/machine-config-operator/pull/2376/
+  # GRPA-3123
+  qemu-kiwi:
+    architectures:
+      - x86_64
+    packages:
+      - qemu-kiwi
+      - ipxe-roms-qemu
+      - libpmem
+      - pixman
+      - qemu-kvm-common
+      - seabios-bin
+      - seavgabios-bin
+      - sgabios-bin