Kernel: Add more infrastructure to support different memory layouts

This adds some structures necessary to support multiple memory regions
in the future. It also adds support for different system memory types
and the new linear heap mapping at 0x30000000.

src/core/hle/kernel/memory.h

@@ -4,10 +4,27 @@
 
 #pragma once
 
+#include <memory>
+
 #include "common/common_types.h"
 
+#include "core/hle/kernel/process.h"
+
 namespace Kernel {
+
 class VMManager;
+
+struct MemoryRegionInfo {
+    u32 base; // Not an address, but offset from start of FCRAM
+    u32 size;
+
+    std::shared_ptr<std::vector<u8>> linear_heap_memory;
+};
+
+void MemoryInit(u32 mem_type);
+void MemoryShutdown();
+MemoryRegionInfo* GetMemoryRegion(MemoryRegion region);
+
 }
 
 namespace Memory {