exec: change ramlist from MRU order to a 1-item cache

Most of the time, only 2 items will be active (from/to for a string operation,
or code/data).  But TCG guests likely won't have gigabytes of memory, so
this actually goes down to 1 item.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
diff --git a/arch_init.c b/arch_init.c
index e01f0e5..6695ccf 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -48,6 +48,7 @@
 #include "qemu/config-file.h"
 #include "qmp-commands.h"
 #include "trace.h"
+#include "exec/cpu-all.h"
 
 #ifdef DEBUG_ARCH_INIT
 #define DPRINTF(fmt, ...) \