x86/cpu-policy: MSR_ARCH_CAPS feature names

x86/cpu-policy: MSR_ARCH_CAPS feature names

Seed the default visibility from the dom0 special case, which for the most
part just exposes the *_NO bits.  EIBRS is the one non-*_NO bit, which is
"just" a status bit to the guest indicating a change in implemention of IBRS
which is already fully supported.

Insert a block dependency from the ARCH_CAPS CPUID bit to the entire content
of the MSR.  This is because MSRs have no structure information similar to
CPUID, and used by x86_cpu_policy_clear_out_of_range_leaves(), in order to
bulk-clear inaccessable words.

The overall CPUID bit is still max-only, so all of MSR_ARCH_CAPS is hidden in
the default policies.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>