[ET-VK] Removing un used push constants for conv2d pw. (#10841)

Pull Request resolved: #10814

This change removes unused push constants from conv2d pw op to reduce memory usage.
ghstack-source-id: 283597017
@exported-using-ghexport

Differential Revision: [D74523769](https://our.internmc.facebook.com/intern/diff/D74523769/)