[llvm] [Libomptarget] Rework device initialization and image registration (PR #93844)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

@ronlieb Updated AMD version https://www.youtube.com/watch?v=z8WvSGNEV24. I did some basic testing on my own machine, the only thing I'm worried about potentially changing is the automatic-zero copy stuff. I'm hoping @carlobertolli can chime in on that.

https://github.com/llvm/llvm-project/pull/93844