selftest/distrodata: clean up exception lists in recipe maintainers test

selftest/distrodata: clean up exception lists in recipe maintainers test

Specifically:
- add missing maintainer.inc entries for initramfs-module-*, systemd-machine-units and
target-sdk-provides-dummy and drop them from exception list.

- remove rust from exception list for unbuildable-by-default recipes as it is now buildable.

- add missing maintainer.inc entry for libx11-compose-data and cve-update-nvd2-native;
as they are also unbuildable by default, they needs to be in exception list as well.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>