Add support for Slot 2 flashcarts using Compact Flash (#84)

- Supercard CF (SUPERCARDCF)
- GBA Media Player CF (MPCF)
- M3 Adapter CF (M3CF)
- Max Media Dock CF (MMCF)

arm9/source/patches/platform/m3cf/M3CFLockUnlockCardPatchCode.h

@@ -0,0 +1,20 @@
+#pragma once
+#include "sections.h"
+#include "patches/PatchCode.h"
+#include "../compactflash-common/ICompactFlashLockUnlockPatchCode.h"
+
+DEFINE_SECTION_SYMBOLS(m3cf_lock_unlock);
+
+extern "C" void m3cf_lockUnlockCard(bool lock);
+
+class M3CFLockUnlockCardPatchCode : public PatchCode, public ICompactFlashLockUnlockPatchCode
+{
+public:
+    explicit M3CFLockUnlockCardPatchCode(PatchHeap& patchHeap)
+        : PatchCode(SECTION_START(m3cf_lock_unlock), SECTION_SIZE(m3cf_lock_unlock), patchHeap) { }
+
+    const void* GetLockUnlockFunction() const override
+    {
+        return GetAddressAtTarget((void*)m3cf_lockUnlockCard);
+    }
+};