[Bugfix][TPU] Return a Default fp8 MoE Backend (#32908)
Signed-off-by: Xiongfei Wei <isaacwxf23@gmail.com>
Signed-off-by: Robert Shaw <robshaw@redhat.com>
Co-authored-by: Robert Shaw <robshaw@redhat.com>
Co-authored-by: Robert Shaw <114415538+robertgshaw2-redhat@users.noreply.github.com>
