x86/shadow: shadow_table[] needs only one entry for PV-only configs

x86/shadow: shadow_table[] needs only one entry for PV-only configs

Furthermore the field isn't needed at all with shadow support disabled -
move it into struct shadow_vcpu.

Introduce for_each_shadow_table(), shortening loops for the 4-level case
at the same time.

Adjust loop variables and a function parameter to be "unsigned int"
where applicable at the same time. Also move a comment that ended up
misplaced due to incremental additions.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Tim Deegan <tim@xen.org>