[CK_TILE] Enable MXFP6 for MX GEMM op (#5095)

## Motivation

Add support for MXFP6 in the MX GEMM op in CK-Tile.

Depends on https://github.com/ROCm/rocm-libraries/pull/4594

## Technical Details

<!-- Explain the changes along with any relevant GitHub links. -->

## Test Plan

<!-- Explain any relevant testing done to verify this PR. -->

## Test Result

<!-- Briefly summarize test outcomes. -->

## Submission Checklist

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

include/ck_tile/host/check_err.hpp

@@ -61,6 +61,7 @@ CK_TILE_HOST double get_relative_threshold(const int number_of_accumulations = 1
                             tf32_t,
                             pk_fp4_t,
                             pk_fp4_raw_t,
+                            pk_fp6x16_t,
                             pk_int4_t,
                             I8,
                             I32,
@@ -135,6 +136,7 @@ CK_TILE_HOST double get_absolute_threshold(const double max_possible_num,
                             tf32_t,
                             pk_fp4_t,
                             pk_fp4_raw_t,
+                            pk_fp6x16_t,
                             pk_int4_t,
                             I8,
                             I32,