Update gemm tiling dim (n) and move function to appropriate spot

[kurtis-b-1]

For some reason tiling dim n for GEMM in CMake was 32 instead of 64--updated it to be 64.

Changed

• Gemm tiling dimension n increased to 64
• The add_gemm_archive function was in an incorrect spot, so moved it with the other functions

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[kurtis-b-1]

@andrej Not sure if this is needed since you're removing the CMake build system, but created this PR just to point to a small issue in the tests for GEMM.

[andrej]

The default n dimension is already changed to 64 in #37 :)