Fix the missing DontCare in TLEdgeOut

src/main/scala/tilelink/Edges.scala

@@ -361,6 +361,7 @@ class TLEdgeOut(
     require (manager.anySupportAcquireB, s"TileLink: No managers visible from this edge support Acquires, but one of these clients would try to request one: ${client.clients}")
     val legal = manager.supportsAcquireBFast(toAddress, lgSize)
     val a = Wire(new TLBundleA(bundle))
+    a :#= DontCare
     a.opcode  := TLMessages.AcquirePerm
     a.param   := growPermissions
     a.size    := lgSize
@@ -443,6 +444,7 @@ class TLEdgeOut(
   def GrantAck(d: TLBundleD): TLBundleE = GrantAck(d.sink)
   def GrantAck(toSink: UInt): TLBundleE = {
     val e = Wire(new TLBundleE(bundle))
+    e :#= DontCare
     e.sink := toSink
     e
   }