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/FileSystem/FIFO.cpp

@@ -41,7 +41,7 @@ ErrorOr<NonnullRefPtr<OpenFileDescription>> FIFO::open_direction_blocking(FIFO::
 
         if (m_writers == 0) {
             locker.unlock();
-            m_write_open_queue.wait_forever("FIFO");
+            m_write_open_queue.wait_forever("FIFO"sv);
             locker.lock();
         }
     }
@@ -51,7 +51,7 @@ ErrorOr<NonnullRefPtr<OpenFileDescription>> FIFO::open_direction_blocking(FIFO::
 
         if (m_readers == 0) {
             locker.unlock();
-            m_read_open_queue.wait_forever("FIFO");
+            m_read_open_queue.wait_forever("FIFO"sv);
             locker.lock();
         }
     }