xiaomi-polaris: move to archived

The maintainer has been inactive and does not have a pmOS
GitLab account. This was actually brought up in the past
with pmaports!6618, but the device ended up staying around.
I pinged the proposed maintainer
[in an MR](https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/9067#note_570185)
instead and they said that archival is fine for now.

[ci:skip-grep]

Signed-off-by: Aster Boese <asterboese@mailbox.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/9073>

device/archived/device-xiaomi-polaris/APKBUILD

@@ -1,6 +1,7 @@
+# Archived: Maintainer is inactive and has no pmOS GitLab account
 
 # Reference: <https://postmarketos.org/devicepkg>
-maintainer="Molly Sophia <mollysophia379@gmail.com>"
+maintainer=""
 pkgname=device-xiaomi-polaris
 pkgdesc="Xiaomi Mi Mix 2S"
 pkgver=10

device/archived/firmware-xiaomi-polaris/APKBUILD

@@ -1,5 +1,6 @@
+# Archived: Maintainer is inactive and has no pmOS GitLab account
 
-maintainer="Molly Sophia <mollysophia379@gmail.com>"
+maintainer=""
 pkgname=firmware-xiaomi-polaris
 pkgver=2
 pkgrel=0