device-samsung-m3: set myself as maintainer (MR 4850)

m3 is very similar to m0, works well with mainline, and deserves a
maintainer and some love.

[ci:skip-build]: already built successfully in CI

device/testing/device-samsung-m3/APKBUILD

@@ -1,8 +1,9 @@
 # Reference: <https://postmarketos.org/devicepkg>
+# Maintainer: Henrik Grimler <henrik@grimler.se>
 pkgname=device-samsung-m3
 pkgdesc="Samsung Galaxy S III LTE"
 pkgver=6.2
-pkgrel=1
+pkgrel=2
 url="https://postmarketos.org"
 license="MIT"
 arch="armv7"