security/tpm2-abrmd: Assorted improvements to the port

• Fix name collision on function write_all():
• Stop installing tpm2-abrmd-devd.conf as it is useless and does not work
• Use "wheel" as FreeBSD does not have the "root" group
• Fix inconsistent naming of the rc script

PR: 286218
Approved by: maintainer
Pull Request: https://github.com/freebsd/freebsd-ports/pull/391