[rocm-libraries] ROCm/rocm-libraries#5387 (commit 0c259bd)

[CK][CK Tile] Grouped Convolution Backward Weight set of fixes (#5387)

## Motivation

Grouped Convolution Backward Weight split k fixes for CK tile kernels

## Technical Details

- get k batch from kargs to get deduced k batch
- multiply zeroing size by data type size
- disable v6 (producing a incorrect results)

## Test Plan

test_grouped_convnd_bwd_weight_tile

## Test Result

Pass

## Submission Checklist

- [x] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

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Co-authored-by: Ville Pietilä <>