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/Memory/MemoryManager.h

@@ -51,10 +51,10 @@ enum class UsedMemoryRangeType {
 };
 
 static constexpr StringView UserMemoryRangeTypeNames[] {
-    "Low memory",
-    "Kernel",
-    "Boot module",
-    "Physical Pages"
+    "Low memory"sv,
+    "Kernel"sv,
+    "Boot module"sv,
+    "Physical Pages"sv
 };
 static_assert(array_size(UserMemoryRangeTypeNames) == to_underlying(UsedMemoryRangeType::__Count));