Clean up inclusion of exec/cpu-common.h

migration/qemu-file.h neglects to include it even though it needs
ram_addr_t.  Fix that.  Drop a few superfluous inclusions elsewhere.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190812052359.30071-14-armbru@redhat.com>
diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index 13baf89..21f3ae4 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -26,6 +26,7 @@
 #define MIGRATION_QEMU_FILE_H
 
 #include <zlib.h>
+#include "exec/cpu-common.h"
 
 /* Read a chunk of data from a file at the given position.  The pos argument
  * can be ignored if the file is only be used for streaming.  The number of