REORG: include: move freq_ctr to haproxy/

types/freq_ctr.h was moved to haproxy/freq_ctr-t.h and proto/freq_ctr.h
was moved to haproxy/freq_ctr.h. Files were updated accordingly, no other
change was applied.
diff --git a/include/types/proxy.h b/include/types/proxy.h
index ca642e2..aeec0ed 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -42,7 +42,7 @@
 #include <types/checks.h>
 #include <types/counters.h>
 #include <types/filters.h>
-#include <types/freq_ctr.h>
+#include <haproxy/freq_ctr-t.h>
 #include <types/listener.h>
 #include <types/log.h>
 #include <types/obj_type.h>