Update on "[ET-VK] Changing texture access pattern for conv2d pw op to improve performance."

This diff changes the texture access pattern for conv2d pw op to iterate first on x axis then y and then z to improve performance.

Differential Revision: [D67769100](https://our.internmc.facebook.com/intern/diff/D67769100/)

[ghstack-poisoned]

Author: trivedivivek