Disable old MobileBERT f16 GPU benchmarks (#6659)
Disable old MobileBERT f16 GPU benchmarks (#6659)

We already have this covered in the new benchmark pipeline, which
is almost ready as the default. So this is a early step for migration over.
iree-org/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,iree-org/iree