test: physical: Fix cppcoreguidelines-special-member-functions

```
../test/physical.cpp:44:7: error: class 'MockLed' defines a non-default destructor but does not define a copy constructor, a copy assignment operator, a move constructor or a move assignment operator [cppcoreguidelines-special-member-functions,-warnings-as-errors]
class MockLed : public phosphor::led::SysfsLed
      ^
```

Change-Id: I8f13a36b826a9661377222dbd4b8a84fcbcdf23a
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/test/physical.cpp b/test/physical.cpp
index a8226a3..8ecef90 100644
--- a/test/physical.cpp
+++ b/test/physical.cpp
@@ -47,6 +47,10 @@
     /* Use a no-args ctor here to avoid headaches with {Nice,Strict}Mock */
     MockLed() : SysfsLed(createSandbox())
     {}
+    MockLed(MockLed& other) = delete;
+    MockLed(MockLed&& other) = delete;
+    MockLed& operator=(MockLed& other) = delete;
+    MockLed&& operator=(MockLed&& other) = delete;
 
     virtual ~MockLed()
     {