[hle] stpl:sys, stpl:u initial implementation (#4435)

These cmds are hardcoded to use 0x20b, also the vftable is the same for `nn::sf::hipc`.

Streamplay is probably not gonna be implemented fully, but some future updates *may* hang when querying for the service, thus registering it at once will avoid such issues.

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4435
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/core/hle/service/filesystem/fsp/fsp_srv.cpp

@@ -154,6 +154,9 @@ FSP_SRV::FSP_SRV(Core::System& system_)
         {720, nullptr, "AbandonAccessFailure"},
         {800, nullptr, "GetAndClearFileSystemProxyErrorInfo"},
         {810, nullptr, "RegisterProgramIndexMapInfo"},
+        {820, nullptr, "GetContentStorageInfoIndex"},
+        {830, nullptr, "EncryptStreamPlaySaveData"},
+        {831, nullptr, "DecryptStreamPlaySaveData"},
         {1000, nullptr, "SetBisRootForHost"},
         {1001, nullptr, "SetSaveDataSize"},
         {1002, nullptr, "SetSaveDataRootPath"},