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

This diff changes the texture access pattern for convolutional depthwise (DW) operations in Executorch's Vulkan backend to iterate first on x axis then y and then z to improve performance.

Differential Revision: [D67770160](https://our.internmc.facebook.com/intern/diff/D67770160/)

[ghstack-poisoned]

Author: trivedivivek