Add CPU_ONLY tag for sparse_feature_hash layer
Add CPU_ONLY tag for sparse_feature_hash layer

Summary: as desc.

Differential Revision: D6997841

fbshipit-source-id: 75a33ea146224979f149a36a063a78d6f18338ee

Yangqing/caffe2,xzturn/caffe2,xzturn/caffe2,Yangqing/caffe2,caffe2/caffe2,xzturn/caffe2,xzturn/caffe2,Yangqing/caffe2,Yangqing/caffe2,xzturn/caffe2,Yangqing/caffe2