Removed assertion that wasn't correct in general.

Signed-off-by: Maciej Kurc <mkurc@antmicro.com>

v2x/vlog_to_pbtype.py

diff --git a/v2x/vlog_to_pbtype.py b/v2x/vlog_to_pbtype.py
index 54bdc8c..c044a15 100755
--- a/v2x/vlog_to_pbtype.py
+++ b/v2x/vlog_to_pbtype.py
@@ -703,9 +703,6 @@
                         port, iodir)
                 attrs["max"] = splitspec[1]
             else:
-                assert iodir == "input", \
-                    ("Only input ports can have {} timing definition."
-                     "Port {}, direction {}.").format(xmltype, port, iodir)
                 attrs["value"] = splitspec[1]
             ET.SubElement(xml_parent, xmltype, attrs)