include: move CPU-related definitions out of qemu-common.h

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

vl.c

@@ -87,6 +87,7 @@ int main(int argc, char **argv)
 #include "sysemu/dma.h"
 #include "audio/audio.h"
 #include "migration/migration.h"
+#include "sysemu/cpus.h"
 #include "sysemu/kvm.h"
 #include "qapi/qmp/qjson.h"
 #include "qemu/option.h"