Everywhere: Add sv suffix to strings relying on StringView(char const*)

Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).

No functional changes.

Kernel/Net/TCPSocket.h

@@ -88,7 +88,7 @@ public:
         case State::TimeWait:
             return "TimeWait"sv;
         default:
-            return "None";
+            return "None"sv;
         }
     }