change global_fp16_constants for test_fc_nnpi_fp16 (#48663)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48663
enable the flag inside the test
Test Plan:
GLOW_NNPI=1 USE_INF_API=1 buck-out/opt/gen/caffe2/caffe2/contrib/fakelowp/test/test_fc_nnpi_fp16nnpi#binary.par
buck test -c glow.nnpi_use_inf_api=true mode/opt //caffe2/caffe2/contrib/fakelowp/test:test_fc_nnpi_fp16nnpi
Reviewed By: hl475
Differential Revision: D25249575
fbshipit-source-id: bb0a64859fa8e70eeea458376998142f37361525
