meta-openbmc-machines: Add Romulus

Romulus is a Power9 OpenPOWER system developed by IBM.

TODO:
 - bump skeleton for config/Romulus.py
 - bump kernel for device tree

Change-Id: I9779f213e3ebc6286f6eaac35650e6c4fe395f80
Signed-off-by: Joel Stanley <joel@jms.id.au>
9 files changed