MAINTAINERS: Add include/sysemu/cpus.h

This header seems to belong to the guest CPU section since it
contains prototypes for cpus.c.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

MAINTAINERS

@@ -83,6 +83,7 @@ F: include/exec/cpu*.h
 F: include/exec/exec-all.h
 F: include/exec/helper*.h
 F: include/exec/tb-hash.h
+F: include/sysemu/cpus.h
 
 FPU emulation
 M: Aurelien Jarno <aurelien@aurel32.net>