I like your interest in using linux on mobiles. your devices have a lineageos port[discontinued] which has the necessary source to build your linux port.
I would suggest you to try building a ubuntu touch OS(beginner level) and then try with Manjaro ARM(hard i think 
). ubuntu touch a has how-to guide to build the port. I don’t know about build guides for Manjaro ARM (pls help me too with that).
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