pine64-pinebookpro: change maintainership

All right, I still use this device daily. I would like to see it stay a community device.

I can't find anything specifically mentioning what the requirements of maintainership are, but I'm willing to give it a try. Objections? Concerns? Helpful advice?

!4734 (closed)

device/community/linux-postmarketos-rockchip/APKBUILD

 # Maintainer: Martijn Braam <martijn@brixit.nl>
+# Maintainer: Quade Curry <qc8086@qc8086.com>
 
 # This is seperate from linux-edge so we can control the release cycle better.
 # If this kernel is updated and fails to boot it's quite hard to recover the