x86/cpuid: do not expand max leaves on restore

x86/cpuid: do not expand max leaves on restore

When restoring limit the maximum leaves to the ones supported by Xen
4.12 in order to not expand the maximum leaves a guests sees. Note
this is unlikely to cause real issues.

Guests restored from Xen versions 4.13 or greater will contain CPUID
data on the stream that will override the values set by
xc_cpuid_apply_policy.

Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>