[M68k] Handle 16 bit MOVs to and from CCR (#114714)

Builds on @TechnoElf 's CCR MOV pr
https://github.com/llvm/llvm-project/pull/107591 and adds some tests.

Fixes https://github.com/llvm/llvm-project/issues/106210

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Co-authored-by: TechnoElf <technoelf@undertheprinter.com>