Fix glow-nnpi-tests running on Sandcastle (#4723)

Summary:
Pull Request resolved: #4723

Tests `LayerNorm_BFloat16` and `Exp_BFloat16` raise errors NNPIErrorCode [99 = Not implemented] running on NNPI

Reviewed By: jfix71

Differential Revision: D22651707

fbshipit-source-id: 07b8cfbc2db8681b8a7a06f11e14d6ce1497597b

Author: hl475

lib/Backends/NNPI/tests/NNPIOperatorTest.cpp

@@ -93,6 +93,7 @@ struct BlacklistInitializer {
             {"CumSum_ExclusiveReverse/0", TestBlacklist::AnyDeviceAnyEngine},
             {"CumSum_WithZeroes/0", TestBlacklist::AnyDeviceAnyEngine},
             {"LayerNorm_Float/0", TestBlacklist::AnyDeviceHWEngine},
+            {"LayerNorm_BFloat16/0", TestBlacklist::AnyDeviceHWEngine},
             {"LengthsSum/0", TestBlacklist::AnyDeviceAnyEngine},
             {"LengthsToRanges/0", TestBlacklist::AnyDeviceAnyEngine},
             {"ModuloInt32NoSignFollow/0", TestBlacklist::AnyDeviceAnyEngine},
@@ -224,6 +225,7 @@ struct BlacklistInitializer {
             {"DequantizeFRWQ_Float16/0", TestBlacklist::AnyDeviceAnyEngine},
             {"DilatedConvolution/0", TestBlacklist::AnyDeviceHWEngine},
             {"Exp/0", TestBlacklist::AnyDeviceHWEngine},
+            {"Exp_BFloat16/0", TestBlacklist::AnyDeviceHWEngine},
             {"FloatArgMaxKeepDim/0", TestBlacklist::AnyDeviceHWEngine},
             {"FloatArgMaxNoKeepDim/0", TestBlacklist::AnyDeviceHWEngine},
             {"FloatArgMaxNoKeepDimWithAxis1/0",