x86/cpuid: replace more cpufeat_word() uses

x86/cpuid: replace more cpufeat_word() uses

Complete what e3662437eb43 ("x86/cpuid: Disentangle logic for new
feature leaves") has begun:

"Switch to using FEATURESET_* just like the policy/featureset helpers.  This
 breaks the cognitive complexity of needing to know which leaf a specifically
 named feature should reside in, and is shorter to write.  It is also far
 easier to identify as correct at a glance, given the correlation with the
 CPUID leaf being read."

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