Enable Barbican build on Ubuntu ARM64

Re-enable the Ubuntu arm64 build. The previous exclusion was due to
uWSGI issue [1], which is no longer reproducible on Ubuntu Noble.

Change-Id: I400e9a9a3bf03053589835f933023eedee504f08
Signed-off-by: Bartosz Bezak <[email protected]>
(cherry picked from commit 85878fe)

Author: bbezak

kolla/image/unbuildable.py

@@ -46,7 +46,6 @@
     },
 
     'ubuntu+aarch64': {
-        "barbican-base",  # https://github.com/unbit/uwsgi/issues/2434
     },
 
     'centos+aarch64': {