Add selfrando detection to the ELF security feature detections

[wagoodman]

What would you like to be added: ELF security feature detection is being added in https://github.com/anchore/syft/pull/2443 . What was carved off of this work was being able to detect selfrando within binaries.

Why is this needed: This is more for completeness, but since this is not a common security feature, consider this a stretch goal.

Additional context: Related to #2434 Broken off of #2443