Git submodules in modules are not fetched

[Cyril-Roques]

Hello,

git submodules for zephyr modules are not fetched automatically during installation of the framework.

After installation of zephyr 2.6 framework the modules directory in filled with modules according their west.yml revision but submodules are not fetched. example .platformio/packages/framework-zephyr/_pio/modules/lib/loramac-node/src/radio/lr1110/lr1110_driver is empty

Thank you