Kernel: ACPI implement integer stores to registers as copies

Before storing const integer and then modifying the register it would
error.

kernel/include/kernel/ACPI/AML/Node.h

@@ -43,6 +43,8 @@ namespace Kernel::ACPI::AML
 
 		virtual bool is_scope() const { return false; }
 
+		virtual BAN::RefPtr<Node> copy() { return this; }
+
 		[[nodiscard]] BAN::Optional<uint64_t> as_integer();
 		[[nodiscard]] virtual BAN::RefPtr<AML::Node> evaluate() { AML_TODO("evaluate, type {}", static_cast<uint8_t>(type)); return nullptr; }
 		[[nodiscard]] virtual bool store(BAN::RefPtr<AML::Node>) { AML_TODO("store, type {}", static_cast<uint8_t>(type)); return false; }