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/src/freq_ctr.c b/src/freq_ctr.c
index 1620156..8249a3a 100644
--- a/src/freq_ctr.c
+++ b/src/freq_ctr.c
@@ -13,7 +13,7 @@
 #include <haproxy/api.h>
 #include <common/standard.h>
 #include <haproxy/time.h>
-#include <proto/freq_ctr.h>
+#include <haproxy/freq_ctr.h>
 
 /* Read a frequency counter taking history into account for missing time in
  * current period. Current second is sub-divided in 1000 chunks of one ms,