Removed redundant non-gemm blksz_t creation.

Details:
- Removed code that creates duplicate blksz_t objects for herk, trmm,
  and trsm. Instead, the gemm blksz_t objects are accessed via extern
  and used directly. This reduces the amount of code associated with
  each of the three _cntl_init() and _cntl_finalize() function.