[llvm] [Offload] Remove handling for COV4 binaries from offload/ (PR #131033)

[Shilei Tian via llvm-commits]

https://github.com/shiltian approved this pull request.

So we are okay that OpenMP will not support COV4 downstream? For upstream I'm totally fine.

https://github.com/llvm/llvm-project/pull/131033