[video_core, hle] remove redundant parent references in system structs (#3908)

reworked a bit to remove references of parent objects and instead pass as arguments to methods to prevent useless reloads

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Co-authored-by: maufeat <sahyno1996@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3908
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>

src/audio_core/in/audio_in_system.cpp

@@ -122,7 +122,7 @@ Result System::Stop() {
         session->SetVolume(0.0f);
         session->ClearBuffers();
         if (buffers.ReleaseBuffers(system.CoreTiming(), *session, true)) {
-            buffer_event->Signal();
+            buffer_event->Signal(system.Kernel());
         }
         state = State::Stopped;
     }
@@ -164,7 +164,7 @@ void System::ReleaseBuffers() {
 
     if (signal) {
         // Signal if any buffer was released, or if none are registered, we need more.
-        buffer_event->Signal();
+        buffer_event->Signal(system.Kernel());
     }
 }
 
@@ -181,7 +181,7 @@ bool System::FlushAudioInBuffers() {
     buffers.FlushBuffers(buffers_released);
 
     if (buffers_released > 0) {
-        buffer_event->Signal();
+        buffer_event->Signal(system.Kernel());
     }
     return true;
 }