[pkg-apparmor] Bug#905160: apparmor: parser: disable expression tree simplification

[intrigeri]

Control: retitle -1 Disable expression tree simplification via parser.conf

Most likely 2.13-7 will disable expression tree simplification
via debian/lib/apparmor/functions, as a temporary workaround:
https://salsa.debian.org/apparmor-team/apparmor/merge_requests/9/diffs?commit_id=97e62e7b06f7e759257eeb3aa62bdca8afb71dac

This bug report is about replacing this temporary workaround with
a proper solution :)