[rocm-libraries] ROCm/rocm-libraries#5785 (commit d8ecfc1)

[CK] Fix min k_batch calculation in conv kernels (#5785)

## Motivation

Avoid division by 0 and remove not needed "-1".

## Technical Details

Our div up implementation return lower value if input is divisible.
There is no need to subtract 1.

## Test Plan

test_grouped_conv_bwd_weight

## Test Result

Passed locally.

## Submission Checklist

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

AICK-1019