Move filters.hpp to events.hpp

Prepare for a more generalized event description framework enabling
event classes other than DBus signal matches.  Filters become a
sub-concept within that framework so rename the file.

Change-Id: I0be9f9997239aad6e798ca16055aedc3e1233994
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/manager.hpp b/manager.hpp
index b9df746..17f950f 100644
--- a/manager.hpp
+++ b/manager.hpp
@@ -6,7 +6,7 @@
 #include <vector>
 #include <sdbusplus/server.hpp>
 #include "xyz/openbmc_project/Inventory/Manager/server.hpp"
-#include "filters.hpp"
+#include "events.hpp"
 #include "actions.hpp"
 
 namespace phosphor