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Adding layout test for amdgcn_mma structs ## Motivation Currently, the test suite for `amdgcn_mma` focuses on the design (e.g. choosing the correct specialization based on SFINAE) and a single live test that checks if selected MmaOp runs. This PR adds a simplified GEMM test kernel that checks the exact layout of the selected MmaOp. ## Technical Details The test in `test_amdgcn_mma_layout.cpp` launches MxKxN test cases (one per block), where each case: 1. Constructs A and B tensors on a device with a single 1 at A(m,k) and B(k,n) (rest is all 0s) 2. Executes the MMA intrinsic. 3. Checks if C has the "1" on the excpeted position. For the MMA instrinsic, it pulls a Mma op from amdgcn_mma specialization based on a given input (tile dimension, data types). Note 1: As a helper, in `test_amdgcn_mma_layout_util.hpp` we add register map for a given amdgcn_mma specialization. Register mapping is currently based on the `tile_distribution_encoding`. Note 2: Everything is added to the test suite, no additions to the actual `amdgcn_mma` structs. All the extra information that is needed, but not yet provided by `amdgcn_mma` structs, is added as a boilerplate to the header. TODO: Rebase this PR on top of the `amdgcn_mma` refactor or clean it up after merge. ## Test Plan This PR solely adds a new test to the existing code. ## Test Result Tests pass. ## Submission Checklist - [x] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.