x86: Merge a domain's {cpuid,msr} policy objects

x86: Merge a domain's {cpuid,msr} policy objects

Right now, they're the same underlying type, containing disjoint information.

Drop the d->arch.msr pointer, and union d->arch.cpuid to give it a second name
of cpu_policy in the interim.

Merge init_domain_{cpuid,msr}_policy() into a single init_domain_cpu_policy(),
moving the implementation into cpu-policy.c

No practical change.  This undoes the transient doubling of storage space from
earlier patches.

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