u-boot-samsung-i9100: move to archived category

The downstream port of i9100 does not use u-boot-samsung-i9100, so it
is essentially dead code. Furthermore, this u-boot is ancient, based
on 2012.04-rc1, with backported patches to get ext4 support. It is
hence not really suitable for use with postmarketos.

[ci:skip-build]: build fails.

Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6847

device/archived/u-boot-samsung-i9100/APKBUILD

@@ -1,5 +1,6 @@
 # Reference: <https://postmarketos.org/devicepkg>
 # Contributor: Paul Cercueil <paul@crapouillou.net>
+# Archived: Not used and does not support "modern" features like extlinux
 pkgname=u-boot-samsung-i9100
 pkgver=2012.04_rc1
 pkgrel=0