Memory: move MarkRegionCached into class

src/core/memory.h

@@ -180,11 +180,6 @@ enum : VAddr {
 
 extern std::array<u8, Memory::FCRAM_N3DS_SIZE> fcram;
 
-/**
- * Mark each page touching the region as cached.
- */
-void RasterizerMarkRegionCached(PAddr start, u32 size, bool cached);
-
 /**
  * Flushes any externally cached rasterizer resources touching the given region.
  */
@@ -258,6 +253,11 @@ public:
     /// Gets offset in FCRAM from a pointer inside FCRAM range
     u32 GetFCRAMOffset(u8* pointer);
 
+    /**
+     * Mark each page touching the region as cached.
+     */
+    void RasterizerMarkRegionCached(PAddr start, u32 size, bool cached);
+
 private:
     template <typename T>
     T Read(const VAddr vaddr);