make two memory hypercalls vNUMA-aware

make two memory hypercalls vNUMA-aware

Make XENMEM_increase_reservation and XENMEM_populate_physmap
vNUMA-aware.

That is, if guest requests Xen to allocate memory for specific vnode,
Xen can translate vnode to pnode using vNUMA information of that guest.

XENMEMF_vnode is introduced for the guest to mark the node number is in
fact virtual node number and should be translated by Xen.

XENFEAT_memory_op_vnode_supported is introduced to indicate that Xen is
able to translate virtual node to physical node.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Hand struct domain via struct memops_arg's respective field to
construct_memop_from_reservation().

Signed-off-by: Jan Beulich <jbeulich@suse.com>