add WidthAdapter from AXI slave to Coreplex TL slave

src/main/scala/rocketchip/Configs.scala

@@ -39,6 +39,8 @@ class BasePlatformConfig extends Config(
             addrBits = Dump("MEM_ADDR_BITS", site(PAddrBits)),
             idBits = Dump("MEM_ID_BITS", site(MIFTagBits)))
         }
+        case TLKey("EdgetoSlave") =>
+          site(TLKey("L1toL2")).copy(dataBeats = site(MIFDataBeats))
         case TLKey("MCtoEdge") =>
           site(TLKey("L2toMC")).copy(dataBeats = site(MIFDataBeats))
         case TLKey("MMIOtoEdge") =>