pine64-pinephone: add myself as maintainer
I daily drive the pinephone. Adding myself to maintainers.
@MartijnBraam said he's also still daily driving it.
@z3ntu, @PureTryOut, @craftyguy, @dylanvanassche: depending on how much you use it, do you want to drop maintainership? Marking as draft until you responded, so we don't need another MR to change the maintainer lines.
Edited by Oliver Smith