hypercall_xlat_continuation: Replace BUG_ON with domain_crash

hypercall_xlat_continuation: Replace BUG_ON with domain_crash

Instead of crashing the host in case of unexpected hypercall parameters,
resort to only crashing the calling domain.

This is part of XSA-454 / CVE-2023-46842.

Fixes: b8a7efe8528a ("Enable compatibility mode operation for HYPERVISOR_memory_op")
Reported-by: Manuel Andreas <manuel.andreas@tum.de>
Signed-off-by: Bjoern Doebel <doebel@amazon.de>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>