Update on "[ET-VK] Removed shared memory usage and simplied conv2d dw op shader to improve performance."

This diff removes shared memory usage in `conv2d_dw_output_tile.glsl` shader to improve performance.
Makes sum a one dimensional array, and moves bias application before storing texel.

Differential Revision: [D75499165](https://our.internmc.facebook.com/intern/diff/D75499165/)

[ghstack-poisoned]

Author: trivedivivek