memory: rename 'exec-obsolete.h'

exec-obsolete.h used to hold pre-memory-API functions that were used from
device code prior to the transition to the memory API.  Now that the
transition is complete, the name no longer describes the file.  The
functions still need to be merged better into the memory core, but there's
no danger of anyone using them.

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

memory.c

@@ -20,8 +20,7 @@
 #include "kvm.h"
 #include <assert.h>
 
-#define WANT_EXEC_OBSOLETE
-#include "exec-obsolete.h"
+#include "memory-internal.h"
 
 unsigned memory_region_transaction_depth = 0;
 static bool global_dirty_log = false;