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/Devices/MemoryDevice.cpp

@@ -67,7 +67,7 @@ ErrorOr<Memory::Region*> MemoryDevice::mmap(Process& process, OpenFileDescriptio
         range,
         move(vmobject),
         0,
-        "Mapped Physical Memory",
+        "Mapped Physical Memory"sv,
         prot,
         shared);
 }