Improve SOFTMAX tests

The old tests wouldn't cover one of the quantized execution paths.

Fix: 129572081
Test: NeuralNetworksTest_static
Change-Id: I0a4036536d7019d49bbe335b2ec971d990fa3d2a
Merged-In: I0a4036536d7019d49bbe335b2ec971d990fa3d2a
(cherry picked from commit 0a5addd76344fddfb680f575f6309009517d68d7)
2 files changed