boot-block: look for a callout in the entry

phosphor-logging callouts always start with a CALLOUT_ in the additional
data entry. Look for this to determine if a callout is present in the
log.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I721e794dc4610a18705e1b0d75e545b14f844402
diff --git a/log_manager.hpp b/log_manager.hpp
index a57f1ab..b24a7f3 100644
--- a/log_manager.hpp
+++ b/log_manager.hpp
@@ -183,6 +183,14 @@
      */
     void checkQuiesceOnError(const Entry& entry);
 
+    /** @brief Check if inventory callout present in input entry
+     *
+     * @param[in] entry - The error to check for callouts
+     *
+     * @return true if inventory item in associations, false otherwise
+     */
+    bool isCalloutPresent(const Entry& entry);
+
   private:
     /*
      * @fn _commit()