aoc/am: Cleanup aoc service and stub am calls (#2414)

* aoc/am: Cleanup aoc service and stub am calls

This PR implement aoc call `GetAddOnContentListChangedEventWithProcessId` (Closes #2408) and `CreateContentsServiceManager`. Additionnally, a big cleanup (checked by RE on latest firmware) is made on the whole service. I've added `CountAddOnContent`, `ListAddOnContent` and `GetAddonContentBaseId` for games which require version `1.0.0-6.2.0` too.

Am service call `ReportUserIsActive` is stubbed (checked by RE, closes #2413).

Since some logic in the service (aoc) which handle the DLCs has been changed, it could be nice to have some testing to be sure there is no regression.

* Remove wrong check

* Addresses gdkchan feedback

* Fix GetAddOnContentLostErrorCode

* fix null pid in services

* Add missing comment

* remove leftover comment

1 files changed, 1 insertions, 1 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Friend/ServiceCreator/IFriendService.cs b/Ryujinx.HLE/HOS/Services/Friend/ServiceCreator/IFriendService.cs
index a2865e9c..f8a7b337 100644
--- a/Ryujinx.HLE/HOS/Services/Friend/ServiceCreator/IFriendService.cs
+++ b/Ryujinx.HLE/HOS/Services/Friend/ServiceCreator/IFriendService.cs
@@ -279,7 +279,7 @@ namespace Ryujinx.HLE.HOS.Services.Friend.ServiceCreator
 
             // Pid placeholder
             context.RequestData.ReadInt64();
-            long pid = context.Process.Pid;
+            long pid = context.Request.HandleDesc.PId;
 
             ulong playHistoryRegistrationKeyPosition = context.Request.PtrBuff[0].Position;
             ulong PlayHistoryRegistrationKeySize     = context.Request.PtrBuff[0].Size;