Add POW op test with same inputs shapes to increase code coverage Fix: 129571542 Test: NNTest_static Change-Id: Ie94a0a36b1df10afff6a5269f9375f99bc6ffba7 Merged-In: Ie94a0a36b1df10afff6a5269f9375f99bc6ffba7 (cherry picked from commit 329ca6a167e35f242c3f6af60d6065f63eef95a3)