Add support for displaying multiple IP addresses at first login

If we have more ethernet devices, we want to list them one after another

Before:
IP address: 1.1.1.1
2.2.2.2

After
IP address: 1.1.1.1,2.2.2.2

packages/bsp/common/usr/lib/armbian/armbian-firstlogin

@@ -147,7 +147,7 @@ get_local_ip_addr() {
 	local retry_message=""
 
 	while [[ -z "$local_device_ip" ]] && [ ${ip_wait_seconds_counter} -ge 0 ]; do
-		local_device_ip=$(ip -4 addr show scope global | grep inet | awk '{print $2}' | cut -d/ -f1)
+		local_device_ip=$(ip -4 addr show scope global | grep inet | awk '{print $2}' | cut -d/ -f1 | awk '{$1=$1}1' FS='\n' OFS=',' RS=)
 
 		# Set retry message if some retries are left, but no IP address has been found yet
 		if [[ -z "$local_device_ip" ]] && [[ $ip_wait_seconds_counter -gt 0 ]]; then