meta-romulus: Add callouts yaml config

Romulus was using the exmaple callouts yaml and it is just a dummy one.
Provide the real callouts yaml config for Romulus.

Tested: With the following commit, verify CALLOUT_INVENTORY_PATH is
        correctly set when CPU error is injected and the event is sent
        to BMC.

Change-Id: I266c51cc52ebdd770dd332c50e26ed3e8cd65155
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/conf/machine/romulus.conf b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/conf/machine/romulus.conf
index e0323dc..d45211c 100644
--- a/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/conf/machine/romulus.conf
+++ b/meta-openbmc-machines/meta-openpower/meta-ibm/meta-romulus/conf/machine/romulus.conf
@@ -16,3 +16,4 @@
 PREFERRED_PROVIDER_virtual/phosphor-ipmi-fru-inventory = "romulus-ipmi-inventory-map-native"
 PREFERRED_PROVIDER_virtual/phosphor-led-manager-config-native = "romulus-led-manager-config-native"
 PREFERRED_PROVIDER_virtual/phosphor-ipmi-fru-read-inventory = "romulus-ipmi-fru-read-inventory-native"
+PREFERRED_PROVIDER_virtual/phosphor-logging-callouts = "romulus-phosphor-logging-callouts-native"