Fixed the update bootstrap dynamic variables

The current bootstrap has some dynamic variables hard coded. Those
variables are dynamically created by build-update-package, so we are putting
the tags back.

Acked-by: Diego Giovane Pasqualin <dgp06@c3sl.ufpr.br>
Acked-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>
Signed-off-by: Vinicius Ruoso <vkr07@c3sl.ufpr.br>