Exclude unused operands from removeOperandTest

Bug: 148208229
Test: TestGenerated/ValidationTest.Test/nnapi_sample*_while*_unused_output*
Change-Id: I39bebefd0e40d370882d614d4beb97ab36c9da8f
Merged-In: I39bebefd0e40d370882d614d4beb97ab36c9da8f
(cherry picked from commit baa4cf02f2733bdb8e680a0e8b08e2f14d1bf9eb)
1 file changed