C++ support on ESP boards

[atiselsts]

Is your feature request related to a problem? Please describe.
I'm trying to build a Zephyr application that has a C++ file and links to a C++ external library (TensorFlow Lite Micro). The application builds fine if the ARM GCC toolchain is used. However, on ESP, which uses the Xtensa GCC toolchain, there are problems.

In the compilation stage, there are a few problems related to incompatible function declarations between Zephyr's header files and the file xtensa-esp32-elf/sys-include/time.h. If I comment out these declarations, I have a number of linker errors about symbols being undefined, for example the __getreent symbol.

Describe the solution you'd like
Properly support C++ on ESP boards. This would allow to run TensorFlow Lite Micro applications with Zephyr on these boards.

[github-actions]

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