IWYU privileges.h in ep_engine.h

cb::rbac::Privilege is used.

Change-Id: Idbef5700063ca13c8b34c7adb1e44ed48e03f477
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/172591
Tested-by: Build Bot <[email protected]>
Reviewed-by: Dave Rigby <[email protected]>

Author: jameseh96

engines/ep/src/ep_engine.h

@@ -22,6 +22,7 @@
 #include <executor/taskable.h>
 #include <memcached/dcp.h>
 #include <memcached/engine.h>
+#include <memcached/rbac/privileges.h>
 #include <platform/cb_arena_malloc_client.h>
 #include <utilities/testing_hook.h>