firstboot: fix sshd configuration and restart it on firstboot

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Change-Id: I06d06538eee533343e3a05535352e613f3944734

overlay/root/firstboot.sh

@@ -23,17 +23,7 @@ resize2fs ${rootdev}
 
 rm -f /etc/ssh/ssh_host* && ssh-keygen -A
 
-case $(cat /sys/firmware/devicetree/base/model) in
-        "Hardkernel Odroid XU4")
-                need_tweak="true"
-                ;;
-        *)
-                need_tweak="false"
-                ;;
-esac
-
-if [ "x${need_tweak}" = "xtrue" ]; then
-	service ssh restart
-fi
+sed -i "s/PasswordAuthentication.*/PasswordAuthentication yes/g" /etc/ssh/sshd_config
+service ssh restart
 
 exit 0