In the docs replace the references to native_posix with native_sim.
And switch the default test platform to native_sim from native_posix.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
Add initial build rules for CHRE. This change includes a Kconfig and
CMakeLists.txt to begin compiling code from the CHRE module.
Additional files are included to bridge the APIs from CHRE's to
Zephyr's. These can be found in modules/chre/include and
modules/chre/src.
Additionally, add a sample to make sure that the module builds. It can
be built via:
```
$ west build -b native_posix -p=always samples/application_development/chre
```
Signed-off-by: Yuval Peress <peress@google.com>
