xen: check pre-allocated page tables for conflict with memory map

xen: check pre-allocated page tables for conflict with memory map

Check whether the page tables built by the domain builder are at
memory addresses which are in conflict with the target memory map.
If this is the case just panic instead of running into problems
later.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
(cherry picked from commit 04414baab5ba862b10bde837c4773ffdbb78f0e0)
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>