main/unl0kr: add to initramfs-extra (MR 3777)

This moves unl0kr and all of its dependencies into the initramfs-extra,
it does so by using a relatively new mkinitfs feature for installing
files into the -extra archive.

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

main/unl0kr/APKBUILD

 # Maintainer: Johannes Marbach <n0-0ne+gitlab@mailbox.org>
 pkgname=unl0kr
 pkgver=0.3.0
-pkgrel=0
+pkgrel=1
 _commit_lvgl=bcf5d79cb4f868270d9f564a92a080e07280b67b
 _commit_lv_drivers=2ed01feab02940c117fa4cd3f83cd4649b8b9f0e
 _commit_squeek2lvgl=b67685dfede0771d2a237e1d8d4e784fcf406a70
@@ -64,7 +64,7 @@ package() {
 		"$pkgdir"/usr/share/postmarketos-mkinitfs-triggers/unl0kr
 
 	install -Dm644 "$srcdir"/unl0kr.files \
-		"$pkgdir"/etc/postmarketos-mkinitfs/files/30-unl0kr.files
+		"$pkgdir"/etc/postmarketos-mkinitfs/files-extra/30-unl0kr.files
 }
 
 sha512sums="