fix typo and service enable

Fix bug reported: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1056714 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1057918

1, fix typo in packages description

2, add [Install] section to qbootctl.service, copied from pd-mapper: https://salsa.debian.org/DebianOnMobile-team/protection-domain-mapper/-/blob/debian/latest/pd-mapper.service.in