Fix for incorrect register usages in ARM64 MOV/MOVN instructions.

[stevielavern]

As reported by issues #1652 and #1591 there were issues in register usages reported by cstool (and associated APIs):

./cstool -d arm64 '00 00 80 D2'
 0  00 00 80 d2  mov	x0, #0
	ID: 488 (mov)
	op_count: 2
		operands[0].type: REG = x0
		operands[0].access: READ | WRITE  // should be WRITE only
		operands[1].type: IMM = 0x0
	Registers read: x0
	Registers modified: x0

This PR fixes the issue and adds a unit test.
Like most other register usage issues, the problem was arch/AArch64/AArch64MappingInsnOp.inc and it would be better to fix the script that was used to generate it, but it's sadly not committed as part of Capstone.

[thomasdangl]

Thanks! This might be a duplicate of #1974.

I think my PR covers more affected instructions, however, I do not currently have a unit test. Perhaps it would make sense to combine both PRs? : )

Best regards,
Thomas

[stevielavern]

Ah yes indeed, that's a PR collision :). Yours definitely covers more things, maybe it makes more sense to use it. Do you want to reuse my unit test? It should hopefully be quite easy to adapt. Thanks!

[thomasdangl]

Sounds good! I have added your unit test to my PR and included some more interesting test cases (aliased instructions and instructions with system registers as operands). Thanks again for your work!

[kabeor]

Thanks again. This PR will be closing cause #1974.