Revert "[quant] Explictly set default quantized engine instead of relying on the order of supported_qengines (#89804)"
This reverts commit 607ff6f4c10914a2a46bab90577cd083a6b3d46d.
Reverted https://github.com/pytorch/pytorch/pull/89804 on behalf of https://github.com/clee2000 due to breaking tests https://hud.pytorch.org/pytorch/pytorch/commit/607ff6f4c10914a2a46bab90577cd083a6b3d46d https://github.com/pytorch/pytorch/actions/runs/3596841274/jobs/6058297637 trunk label didnt kick off workflows fast enough
