arm64: Reset revision counter

Let's not start from "r12.3-2xx" for this development cycle...

git-version.sh

@@ -51,8 +51,8 @@ esac
 
 full_date="$month $day$suffix, $year"
 
-sha="$(git describe --abbrev=1)"
-rev=arm64-$(echo "$sha" | sed 's/-g[^-]*$//')
+sha="$(git describe --abbrev=1 --match='xry111/arm64-r*')"
+rev=$(echo "$sha" | sed 's/-g[^-]*$//; s|^xry111/||')
 version="$rev"
 versiond="$rev-systemd"