[PS4/PS5][profiling] Go back to the old way of doing a runtime hook

Profiling stopped working for us after D98061, which was largely a
Fuschia-specific patch but in one place used `isOSBinFormatELF` to
make a decision.  I'm adding a PS4/PS5 exception to that, so we can
get profiling to work again.

Differential Revision: https://reviews.llvm.org/D127506