Don't merge qnnpack (#120676)
Summary: qnnack library merge fails on some application. This fix implements recommendation from Android build team to prevent merge for qnnpack.
Test Plan:
1. Measure the binary size impact
1. Release build failed previously; now it should succeed
Differential Revision: D54048156
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120676
Approved by: https://github.com/kimishpatel
