M680X - remove unused s_cpu_type

[XVilka]

If you compile capstone with -Werror warning enabled it produces the following error:

  CC      arch/M680X/M680XDisassembler.o
arch/M680X/M680XDisassembler.c:2124:20: error: variable 's_cpu_type' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
static const char *s_cpu_type[] = {
                   ^
1 error generated.

Since s_cpu_type is not used anywhere in the next branch, it's safe to just remove it completely. It was used in the master branch only, albeit also unnecessary.

cc @trufae @ret2libc

[XVilka]

@aquynh @catenacyber please take a look

[aquynh]

@aladur please ack.

[aladur]

s_cpu_type is not used and can be removed, commit is fine.
Thanks.

[aquynh]

merged, thanks!

[catenacyber]

Always good to remove code :-)