tools/libxl: Fixes to libxl__domain_set_paging_mempool_size()

tools/libxl: Fixes to libxl__domain_set_paging_mempool_size()

The error message accidentally printed the bytes value as if it were kB.

Furthermore, both b_info.shadow_memkb and shadow_mem are uint64_t, meaning
there is a risk of overflow if the user specified a stupidly large value in
the vm.cfg file.  Check and reject such a condition.

Fixes: 7c3bbd940dd8 ("xen/arm, libxl: Revert XEN_DOMCTL_shadow_op; use p2m mempool hypercalls")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Release-acked-by: Henry Wang <Henry.Wang@arm.com>