Core: Merge Direct Memory Areas (#3084)

* Merge dmem areas

* Fix DirectMemoryArea::CanMergeWith

Don't merge dmem areas if the memory types are different.

* Reduce some warnings to info

Both functions should behave properly now, there's no reason to warn about their use.

* Clang

src/core/memory.cpp

@@ -222,6 +222,7 @@ PAddr MemoryManager::Allocate(PAddr search_start, PAddr search_end, size_t size,
     auto& area = CarveDmemArea(mapping_start, size)->second;
     area.memory_type = memory_type;
     area.is_free = false;
+    MergeAdjacent(dmem_map, dmem_area);
     return mapping_start;
 }