[NNAPI] Fix MUL op (#47519)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47519
This wasn't updated when _do_add_binary was refactored.
Test Plan: Upcoming unit test.
Reviewed By: axitkhurana
Differential Revision: D25317938
Pulled By: dreiss
fbshipit-source-id: 99212404c189481cfa692dd77d8f7c7865b6872b
