Add org/open_power D-Bus interfaces

In an effort to define all of the D-Bus interfaces in one place, this
commit adds the interfaces from the openpower-dbus-interfaces
repository.

To compile these interfaces, use the --enable-openpower-dbus-interfaces
configure flag.

Change-Id: I801cab4ac979e56d8325a42c14319a0b7cd094bb
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/org/open_power/Host.errors.yaml b/org/open_power/Host.errors.yaml
new file mode 100644
index 0000000..ab3df62
--- /dev/null
+++ b/org/open_power/Host.errors.yaml
@@ -0,0 +1,5 @@
+- name: Event
+  description: A host system event was received
+
+- name: MaintenanceProcedure
+  description: A host system event with a procedure callout