NNAPI: Support const values in binary ops
Summary:
NNAPI converter failed with 1 const value and one tensor earlier
Code suggestions from dreiss
Test Plan:
pytest test/test_nnapi.py::TestNNAPI::test_pointwise_binary
Imported from OSS
Reviewed By: anshuljain1
Differential Revision: D28893881
fbshipit-source-id: 59240373fb03c6fdafa4cb2fa4d8408dd20092f6
