Add installation target to the message_handler application

Change-Id: Ic21cc7690b1533f2db849a73ac25a7976bf02d1f
diff --git a/applications/message_handler/CMakeLists.txt b/applications/message_handler/CMakeLists.txt
index 27a4815..3f87e64 100644
--- a/applications/message_handler/CMakeLists.txt
+++ b/applications/message_handler/CMakeLists.txt
@@ -48,3 +48,8 @@
     $<$<BOOL:${MESSAGE_HANDLER_MODEL_1}>:MODEL_1=${MESSAGE_HANDLER_MODEL_1}>
     $<$<BOOL:${MESSAGE_HANDLER_MODEL_2}>:MODEL_2=${MESSAGE_HANDLER_MODEL_2}>
     $<$<BOOL:${MESSAGE_HANDLER_MODEL_3}>:MODEL_3=${MESSAGE_HANDLER_MODEL_3}>)
+
+install(FILES $<TARGET_FILE:message_handler>
+    DESTINATION "lib/firmware"
+    RENAME "arm-${ETHOSU_TARGET_NPU_CONFIG}.fw"
+)