pipeline GW: clean up buffer

src/gateware/cxp_pipeline.py

@@ -580,7 +580,7 @@ class Trigger_Ack_Checker(Module, AutoCSR):
         )
 
 class Buffer(Module):
-    def __init__(self, layout, omits=None):
+    def __init__(self, layout):
         self.sink = stream.Endpoint(layout)
         self.source = stream.Endpoint(layout)
 
@@ -588,7 +588,7 @@ class Buffer(Module):
 
         self.sync += [
             If((~self.source.stb | self.source.ack),
-                self.sink.connect(self.source, omit={"ack"}.union(omits) if omits else {"ack"}),
+                self.sink.connect(self.source, omit={"ack"}),
             ),
         ]
         self.comb += [