sysfs: Fix cppcoreguidelines-special-member-functions

```
../sysfs.hpp:24:7: error: class 'SysfsLed' defines a default destructor and a copy constructor but does not define a copy assignment operator, a move constructor or a move assignment operator [cppcoreguidelines-special-member-functions,-warnings-as-errors]
class SysfsLed
      ^
```

Change-Id: I778766f6285e87f6c3de194e058ecf6e620e4512
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/sysfs.hpp b/sysfs.hpp
index a809378..5ce1af1 100644
--- a/sysfs.hpp
+++ b/sysfs.hpp
@@ -28,6 +28,9 @@
     {}
     SysfsLed() = delete;
     SysfsLed(const SysfsLed& other) = delete;
+    SysfsLed(const SysfsLed&& other) = delete;
+    SysfsLed& operator=(const SysfsLed& other) = delete;
+    SysfsLed&& operator=(const SysfsLed&& other) = delete;
 
     virtual ~SysfsLed() = default;