Macro `str_` conflicts with third party libraries

[bblanchon]

RAK-nRF52-RUI/cores/nRF5/component/service/mode/cli/atcmd_queue.h

Line 21 in 00ff6b1

#define str_(s) #s

This macro conflicts with ArduinoJson (bblanchon/ArduinoJson#1978).

Please use a naming convention that doesn't clash with standard C++ practices.
For example, use ALL_CAPS, as recommended in the Core Guidelines.