meta-romulus: Add ipmi channel.yaml

In phosphor-ipmi-host, channel.yaml sets the info about number of
available Ethernet channels.
Romulus has eth0 only.

Tested: Verify the generated channel-gen.cpp reflects this yaml
config.

Change-Id: I902f6b0adb6066ad2c4f1654a4614bbf012e36a5
Signed-off-by: Lei YU <mine260309@gmail.com>
2 files changed