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/mpcf/MPCFLoaderPlatform.h

@@ -0,0 +1,27 @@
+#pragma once
+#include "common.h"
+#include "../compactflash-common/CompactFlashCommonLoaderPlatform.h"
+
+/// @brief Implementation of LoaderPlatform for the DATEL line of flashcarts
+class MPCFLoaderPlatform : public CompactFlashCommonLoaderPlatform
+{
+protected:
+    void SetCardLocked(bool locked) const override { }
+
+    const cf_registers_t& GetCfRegisters() const override
+    {
+        static const cf_registers_t registers
+        {
+            .data           = (vu16*)0x09000000,
+            .altStatus      = (vu16*)0x098C0000,
+            .command        = (vu16*)0x090E0000,
+            .error          = (vu16*)0x09020000,
+            .sectorCount    = (vu16*)0x09040000,
+            .lba1           = (vu16*)0x09060000,
+            .lba2           = (vu16*)0x09080000,
+            .lba3           = (vu16*)0x090A0000,
+            .lba4           = (vu16*)0x090C0000,
+        };
+        return registers;
+    }
+};