Rename cplusplus files for consistency

Change-Id: I908ea337ffb7229a33af3364b5374209c7e9df54
diff --git a/applications/inference_process/CMakeLists.txt b/applications/inference_process/CMakeLists.txt
index ba9e44b..3348d28 100644
--- a/applications/inference_process/CMakeLists.txt
+++ b/applications/inference_process/CMakeLists.txt
@@ -23,7 +23,7 @@
 target_include_directories(inference_process PUBLIC include
                            PRIVATE ${TENSORFLOW_PATH} ${TENSORFLOW_PATH}/tensorflow/lite/micro/tools/make/downloads/flatbuffers/include)
 target_link_libraries(inference_process PUBLIC tflu cmsis_core cmsis_device)
-target_sources(inference_process PRIVATE src/inference_process.cc)
+target_sources(inference_process PRIVATE src/inference_process.cpp)
 
 # Set arena size
 target_compile_definitions(inference_process PRIVATE TENSOR_ARENA_SIZE=${TR_ARENA_SIZE})
diff --git a/applications/inference_process/src/inference_process.cc b/applications/inference_process/src/inference_process.cpp
similarity index 100%
rename from applications/inference_process/src/inference_process.cc
rename to applications/inference_process/src/inference_process.cpp
diff --git a/applications/message_process/CMakeLists.txt b/applications/message_process/CMakeLists.txt
index 2f7e5cf..ed27dcd 100644
--- a/applications/message_process/CMakeLists.txt
+++ b/applications/message_process/CMakeLists.txt
@@ -16,6 +16,6 @@
 # limitations under the License.
 #
 
-add_library(message_process STATIC src/message_process.cc)
+add_library(message_process STATIC src/message_process.cpp)
 target_include_directories(message_process PUBLIC include ${LINUX_DRIVER_STACK_PATH}/kernel)
 target_link_libraries(message_process PRIVATE cmsis_core inference_process ethosu_mailbox)
diff --git a/applications/message_process/src/message_process.cc b/applications/message_process/src/message_process.cpp
similarity index 100%
rename from applications/message_process/src/message_process.cc
rename to applications/message_process/src/message_process.cpp