Which version of Moodle. Where did you get it from? If you have a complete download of Moodle then (in 3.8 anyway) block_lp does indeed require tool_lp but it's definitely there.
https://github.com/moodle/moodle/tree/MOODLE_38_STABLE/admin/tool/lp
https://github.com/moodle/moodle/tree/MOODLE_38_STABLE/admin/tool/lp