KVM: x86: Add a macro for features that are synthesized into boot_cpu_data

Add yet another CPUID macro, this time for features that the host kernel
synthesizes into boot_cpu_data, i.e. that the kernel force sets even in
situations where the feature isn't reported by CPUID.  Thanks to the
macro shenanigans of kvm_cpu_cap_init(), such features can now be handled
in the core CPUID framework, i.e. don't need to be handled out-of-band and
thus without as many guardrails.

Adding a dedicated macro also helps document what's going on, e.g. the
calls to kvm_cpu_cap_check_and_set() are very confusing unless the reader
knows exactly how kvm_cpu_cap_init() generates kvm_cpu_caps (and even
then, it's far from obvious).

Link: https://lore.kernel.org/r/20241128013424.4096668-53-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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