Kernel: Rewrite whole AML parser

Now AML parsing is actually done while respecting namespaces and
scopes. I implemented the minimal functionality to parse qemu's AML.

Next step is to implement AML interpreting and then we can drop lai
as a dependency.

kernel/include/kernel/ACPI/AML/Device.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <kernel/ACPI/AML/ParseContext.h>
+#include <kernel/ACPI/AML/Pkg.h>
+#include <kernel/ACPI/AML/Scope.h>
+
+namespace Kernel::ACPI::AML
+{
+
+	struct Device : public AML::Scope
+	{
+		Device(NameSeg name) : Scope(name, Node::Type::Device) {}
+
+		static ParseResult parse(ParseContext& context)
+		{
+			ASSERT(context.aml_data.size() >= 2);
+			ASSERT(static_cast<AML::Byte>(context.aml_data[0]) == AML::Byte::ExtOpPrefix);
+			ASSERT(static_cast<AML::ExtOp>(context.aml_data[1]) == AML::ExtOp::DeviceOp);
+			context.aml_data = context.aml_data.slice(2);
+
+			auto device_pkg = AML::parse_pkg(context.aml_data);
+			if (!device_pkg.has_value())
+				return ParseResult::Failure;
+
+			auto name_string = AML::NameString::parse(device_pkg.value());
+			if (!name_string.has_value())
+				return ParseResult::Failure;
+
+			auto device = MUST(BAN::RefPtr<Device>::create(name_string->path.back()));
+			if (!context.root_namespace->add_named_object(context.scope.span(), name_string.value(), device))
+				return ParseResult::Failure;
+
+			return device->enter_context_and_parse_term_list(context, name_string.value(), device_pkg.value());
+		}
+
+		virtual void debug_print(int indent) const override
+		{
+			AML_DEBUG_PRINT_INDENT(indent);
+			AML_DEBUG_PRINT("Device ");
+			name.debug_print();
+			AML_DEBUG_PRINTLN(" {");
+			for (const auto& [name, object] : objects)
+			{
+				object->debug_print(indent + 1);
+				AML_DEBUG_PRINTLN("");
+			}
+			AML_DEBUG_PRINT_INDENT(indent);
+			AML_DEBUG_PRINT("}");
+		}
+	};
+
+}