Update base for Update on "[ET-VK] Implement linear_qcs4w"

## Context

Title says it all!

## Changes

Extended the implementation of `linear_qcsnw` to support packed 4-bit weight tensors.

Differential Revision: [D73941991](https://our.internmc.facebook.com/intern/diff/D73941991/)

[ghstack-poisoned]

Author: SS-JIA