Allow the macw and macl instructions to be used on CPUs that have emacs support.

Allow the macw and macl instructions to be used on CPUs that have emacs support.

From PR 22123:

  The common opcodes of emac and mac seem to be only implemented for mac.

  To reproduce:

    echo "macw %d3l,%a0l" > /tmp/dummy.S
    m68k-unknown-elf-as -m5208  /tmp/dummy.S

  Outputs something like:
    /tmp/dummy.S: Assembler messages:
    /tmp/dummy.S:1: Error: operands mismatch -- statement `macw %d3l,%a0l' ignored

  This behavior occurs only if the CPU supports only emac but not explicitly mac (but emac is a superset of mac).