TELIT HE910: Move onboard chip source files to connectivity drivers dir

This is a better location and make them available to all targets
that may have the chip on-baord.

Author: hugueskamba

connectivity/drivers/cellular/TELIT/HE910/CMakeLists.txt

@@ -8,5 +8,6 @@ target_include_directories(mbed-cellular
 
 target_sources(mbed-cellular
     INTERFACE
+        ONBOARD_TELIT_HE910.cpp
         TELIT_HE910.cpp
 )

targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F413xH/TARGET_MTS_DRAGONFLY_F413RH/ONBOARD_TELIT_HE910.cpp renamed to connectivity/drivers/cellular/TELIT/HE910/ONBOARD_TELIT_HE910.cpp

@@ -9,10 +9,6 @@ elseif("MTS_DRAGONFLY_F413RH" IN_LIST MBED_TARGET_LABELS)
     target_include_directories(mbed-core INTERFACE TARGET_MTS_DRAGONFLY_F413RH)
     set(PERIPHERALPINS_FILE TARGET_MTS_DRAGONFLY_F413RH/PeripheralPins.c)
     set(SYSTEM_CLOCK_FILE TARGET_MTS_DRAGONFLY_F413RH/system_clock.c)
-
-# TODO CMAKE: Should the ONBOARD_TELIT_HE910.cpp and ONBOARD_TELIT_HE910.h
-# below be moved to mbed-os/connectivity/drivers/cellular/TELIT/HE910 ?
-    target_sources(mbed-core INTERFACE TARGET_MTS_DRAGONFLY_F413RH/ONBOARD_TELIT_HE910.cpp)
 elseif("NUCLEO_F413ZH" IN_LIST MBED_TARGET_LABELS)
     target_include_directories(mbed-core INTERFACE TARGET_NUCLEO_F413ZH)
     set(PERIPHERALPINS_FILE TARGET_NUCLEO_F413ZH/PeripheralPins.c)