vm_page: Fix inconsistent use of VM_NOFREE_IMPORT_ORDER in vm_page_alloc_nofree_domain

Pass VM_NOFREE_IMPORT_ORDER to vm_phys_alloc_pages instead of
VM_LEVEL_0_ORDER when allocating a higher-order page for
the NOFREE page allocator.

Reported by: alc
Fixes: a8693e8