[Clang] Lift HIPSPV onto the new offload driver (#168043)
Update HIPSPV toolchain to support `--offload-new-driver`. Additionally,
tailor `llvm-spirv` invocation for
[chipStar](https://github.com/CHIP-SPV/chipStar) via
`spirv64-*-chipstar` offload triple.
Depends on one commit from #170467 and one from #170655.
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Co-authored-by: Henry Linjamäki <henry.mikael.linjamaki@intel.com>
Co-authored-by: Joseph Huber <huberjn@outlook.com>
