dcmi: get sensor info: read config

This commit adds the code to read dcmi sensor config, in order to
respond to the 'get sensor info' command.

Resolves openbmc/openbmc#2623.

Change-Id: Id661ec2c1bae214b503308577d7f825a5dfeb629
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/dcmihandler.hpp b/dcmihandler.hpp
index 09921a0..e2a4c10 100644
--- a/dcmihandler.hpp
+++ b/dcmihandler.hpp
@@ -449,6 +449,14 @@
 
 namespace sensor_info
 {
+    /** @brief Create response from JSON config.
+     *
+     *  @param[in] config - JSON config info about DCMI sensors
+     *
+     *  @return Sensor info response
+     */
+    Response createFromJson(const Json& config);
+
     /** @brief Read sensor info and fill up DCMI response for the Get
      *         Sensor Info command. This looks at a specific
      *         instance.