[am] Add Unknown90 to ILibraryAppletAccessor

Fixes crashes in BOTW 1.8.2 and EOW 1.1.0 when not using Auto-Stub
TODO: Rename once documented in SwitchBrew

src/core/hle/service/am/service/library_applet_accessor.cpp

@@ -28,6 +28,7 @@ ILibraryAppletAccessor::ILibraryAppletAccessor(Core::System& system_,
         {30, D<&ILibraryAppletAccessor::GetResult>, "GetResult"},
         {50, nullptr, "SetOutOfFocusApplicationSuspendingEnabled"},
         {60, D<&ILibraryAppletAccessor::PresetLibraryAppletGpuTimeSliceZero>, "PresetLibraryAppletGpuTimeSliceZero"},
+        {90, nullptr, "Unknown90"},
         {100, D<&ILibraryAppletAccessor::PushInData>, "PushInData"},
         {101, D<&ILibraryAppletAccessor::PopOutData>, "PopOutData"},
         {102, nullptr, "PushExtraStorage"},