x86/bugs: Rename various 'ia32_cap' variables to 'x86_arch_cap_msr'

So we are using the 'ia32_cap' value in a number of places,
which got its name from MSR_IA32_ARCH_CAPABILITIES MSR register.

But there's very little 'IA32' about it - this isn't 32-bit only
code, nor does it originate from there, it's just a historic
quirk that many Intel MSR names are prefixed with IA32_.

This is already clear from the helper method around the MSR:
x86_read_arch_cap_msr(), which doesn't have the IA32 prefix.

So rename 'ia32_cap' to 'x86_arch_cap_msr' to be consistent with
its role and with the naming of the helper function.

Signed-off-by: Ingo Molnar <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Nikolay Borisov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Sean Christopherson <[email protected]>
Link: https://lore.kernel.org/r/9592a18a814368e75f8f4b9d74d3883aa4fd1eaf.1712813475.git.jpoimboe@kernel.org

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