fairphone-fp4: move to community (MR 3364)

The device fulfils the requirements for community category, and I plan
to maintain and develop this device further going forward. Move it!

[ci:skip-vercheck]: linux pkg was moved
[ci:skip-build]: already built successfully in CI

device/community/device-fairphone-fp4/APKBUILD

@@ -1,8 +1,9 @@
 # Reference: <https://postmarketos.org/devicepkg>
+# Maintainer: Luca Weiss <luca@z3ntu.xyz>
 pkgname=device-fairphone-fp4
 pkgdesc="Fairphone 4"
 pkgver=0.8
-pkgrel=0
+pkgrel=1
 url="https://postmarketos.org"
 license="MIT"
 arch="aarch64"