Remove completed nvmap TODO

Pins have been implemented so the to-do is no longer needed.

app/src/main/cpp/skyline/services/nvdrv/core/nvmap.cpp

@@ -34,8 +34,6 @@ namespace skyline::service::nvdrv::core {
         alignedSize = util::AlignUp(size, align);
         address = pAddress;
 
-        // TODO: pin init
-
         allocated = true;
 
         return PosixResult::Success;