Submodulify ucg and update to v1.5.2 (#2503)
* turn ucg into submodule * update ucg to 1.5.2 * add license note to doc * align docs with esp32 * move ucg hal into platform folder adapt examples
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* turn ucg into submodule * update ucg to 1.5.2 * add license note to doc * align docs with esp32 * move ucg hal into platform folder adapt examples