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/serial/uart.hh

@@ -51,7 +51,7 @@ class Uart : public BasicPioDevice
     SerialDevice *device;
 
   public:
-    PARAMS(Uart);
+    using Params = UartParams;
     Uart(const Params &p, Addr pio_size);
 
     /**

src/dev/serial/uart8250.hh

@@ -209,7 +209,7 @@ class Uart8250 : public Uart
     EventFunctionWrapper rxIntrEvent;
 
   public:
-    PARAMS(Uart8250);
+    using Params = Uart8250Params;
     Uart8250(const Params &p);
 
     Tick read(PacketPtr pkt) override;