1. Removed the libomp.lib hardcoded from cmake scripts and made it user configurable. By default libomp.lib is used as an omp library.
2. Added the STATIC_LIBRARY_OPTIONS property in set_target_properties cmake command to link omp library to build static-mt blis library.
3. Updated the blis_ref_kernel_mirror.py to give support for zen4 architecture.
AMD-Internal: CPUPL-1630
Change-Id: I54b04cde2fa6a1ddc4b4303f1da808c1efe0484a