feat: differentiate machine-id generation in x86 target

misc/emissary/uci-defaults/99-machine-id.sh

@@ -12,13 +12,13 @@ main() {
 
     # Accumulate data to create unique machine id
     local mac_addresses=$(cat /sys/class/net/*/address | uniq | sort)
-    local device_uuid=$(dmidecode | grep UUID)
+    local device_model=$(cat /sys/firmware/devicetree/base/model)
 
     # Ensure destination directory
     mkdir -p "$(dirname "$machine_id_file")"
 
     # Generate SHA256 hash of data and save it to $machine_id_file
-    echo "$mac_adresses $device_uuid" | sha256sum | cut -d ' ' -f1 > "$machine_id_file"
+    echo "$mac_adresses $device_model" | sha256sum | cut -d ' ' -f1 > "$machine_id_file"
 }
 
 main