libxc: fix vNUMA memory allocation

libxc: fix vNUMA memory allocation

Only 4KB allocation was using new_memflags.  We should use new_memflags
in for 2MB and 1GB allocation as well because that variable contains
node information.

Without this patch, when creating a HVM guest with vNUMA, because the
node information was not present in the flags passed to libxc, actual
memory allocation didn't comply with what user specified. With this
patch the behaviour is correct.

Reported-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Dario Faggioli <dario.faggioli@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>