xen: check for initrd conflicting with e820 map

xen: check for initrd conflicting with e820 map

Check whether the initrd is placed at a location which is conflicting
with the target E820 map. If this is the case relocate it to a new
area unused up to now and compliant to the E820 map.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
(cherry picked from commit 4b9c15377f96e241be347fd3bbeeff74fbad0b44)
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>