x86/shadow: have just a single instance of sh_set_toplevel_shadow()

x86/shadow: have just a single instance of sh_set_toplevel_shadow()

The only guest/shadow level dependent piece here is the call to
sh_make_shadow(). Make a pointer to the respective function an
argument of sh_set_toplevel_shadow(), allowing it to be moved to
common.c.

This implies making get_shadow_status() available to common.c; its set
and delete counterparts are moved along with it.

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