numa: Move NUMA declarations from sysemu.h to numa.h

Not all sysemu.h users need the NUMA declarations, and keeping them in a
separate file makes it easier to see what are the interfaces provided by
numa.c.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/vl.c b/vl.c
index 8c8f142..eca970e 100644
--- a/vl.c
+++ b/vl.c
@@ -78,6 +78,7 @@
 #include "monitor/monitor.h"
 #include "ui/console.h"
 #include "sysemu/sysemu.h"
+#include "sysemu/numa.h"
 #include "exec/gdbstub.h"
 #include "qemu/timer.h"
 #include "sysemu/char.h"