[NFC][X86] Reorg MC tests for APX promoted instrs (#76697)

As suggested in https://github.com/llvm/llvm-project/pull/76210, this
patch re-organize the mc tests for apx promoted instrs, instr tests
within same cpuid would be listed in one test.
Also add explicit prefix {evex} tests and 8 displacement memory test,
promoted instrs need set No_CD8 to avoid AVX512 compress encoding.