misc: Remove unused params() definitions

Lots of times the params() helper has been defined but not used

Change-Id: Id71829aca71341d46964d8f071099342b946b62f
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41613
Tested-by: kokoro <noreply+kokoro@google.com>

src/dev/net/etherswitch.hh

@@ -51,7 +51,7 @@
 class EtherSwitch : public SimObject
 {
   public:
-    PARAMS(EtherSwitch);
+    using Params = EtherSwitchParams;
 
     EtherSwitch(const Params &p);
     ~EtherSwitch();