Add support for fetching ethosu capabilities

Change-Id: I5507b42a66649ab04f7a5932777830d105b3123b
diff --git a/applications/message_process/include/message_process.hpp b/applications/message_process/include/message_process.hpp
index b10d52f..851be04 100644
--- a/applications/message_process/include/message_process.hpp
+++ b/applications/message_process/include/message_process.hpp
@@ -88,6 +88,7 @@
     void sendPong();
     void sndErrorRspAndResetQueue(EthosU::ethosu_core_msg_err_type type, const char *message);
     void sendVersionRsp();
+    void sendCapabilityRsp(uint64_t userArg);
     void sendInferenceRsp(uint64_t userArg,
                           std::vector<InferenceProcess::DataPtr> &ofm,
                           bool failed,