Fix k8 dbg builds
Fix k8 dbg builds

There is a bug in Tensorflow that requires disabling arm_neon in dbg
builds. Have our builds disable this option in k8 dbg. Also removes
duplicate ffp-contract (which doesn't apply to k8).

https://github.com/tensorflow/tensorflow/issues/33360.

Tested: dbg/opt for k8/aarch64
Change-Id: I2575604961725e543feafa5585e04ada5609860e

google-coral/demo-manufacturing,google-coral/demo-manufacturing,google-coral/demo-manufacturing,google-coral/demo-manufacturing