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/Syscalls/pledge.cpp

@@ -31,7 +31,7 @@ ErrorOr<FlatPtr> Process::sys$pledge(Userspace<Syscall::SC_pledge_params const*>
         auto found_invalid_pledge = true;
         pledge_spec.for_each_split_view(' ', false, [&mask, &found_invalid_pledge](auto const& part) {
 #define __ENUMERATE_PLEDGE_PROMISE(x)   \
-    if (part == StringView { #x }) {    \
+    if (part == #x##sv) {               \
         mask |= (1u << (u32)Pledge::x); \
         return;                         \
     }