Eliminate qapi/qmp/types.h

qapi/qmp/types.h is a convenience header to include a number of
qapi/qmp/ headers.  Since we rarely need all of the headers
qapi/qmp/types.h includes, we bypass it most of the time.  Most of the
places that use it don't need all the headers, either.

Include the necessary headers directly, and drop qapi/qmp/types.h.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180201111846.21846-9-armbru@redhat.com>

tests/test-string-output-visitor.c

@@ -16,7 +16,6 @@
 #include "qapi/error.h"
 #include "qapi/string-output-visitor.h"
 #include "test-qapi-visit.h"
-#include "qapi/qmp/types.h"
 
 typedef struct TestOutputVisitorData {
     Visitor *ov;