core: Prepare various classes for memory read/write migration

Amends a few interfaces to be able to handle the migration over to the
new Memory class by passing the class by reference as a function
parameter where necessary.

Notably, within the filesystem services, this eliminates two ReadBlock()
calls by using the helper functions of HLERequestContext to do that for
us.

src/audio_core/audio_renderer.h

@@ -22,6 +22,10 @@ namespace Kernel {
 class WritableEvent;
 }
 
+namespace Memory {
+class Memory;
+}
+
 namespace AudioCore {
 
 class AudioOut;
@@ -217,7 +221,8 @@ static_assert(sizeof(UpdateDataHeader) == 0x40, "UpdateDataHeader has wrong size
 
 class AudioRenderer {
 public:
-    AudioRenderer(Core::Timing::CoreTiming& core_timing, AudioRendererParameter params,
+    AudioRenderer(Core::Timing::CoreTiming& core_timing, Memory::Memory& memory_,
+                  AudioRendererParameter params,
                   std::shared_ptr<Kernel::WritableEvent> buffer_event, std::size_t instance_number);
     ~AudioRenderer();
 
@@ -238,7 +243,8 @@ private:
     std::vector<VoiceState> voices;
     std::vector<EffectState> effects;
     std::unique_ptr<AudioOut> audio_out;
-    AudioCore::StreamPtr stream;
+    StreamPtr stream;
+    Memory::Memory& memory;
 };
 
 } // namespace AudioCore