Kernel: Rework AML namespace and object hierarchy

Remove tree-like structure from AML. This allows more spec compliant
parsing of named objects inside not yet declared devices.

This also allows AML to be run thread safely. All object adds/removes
are now guarded by a mutex.

kernel/include/kernel/ACPI/AML/Method.h

@@ -59,7 +59,7 @@ namespace Kernel::ACPI::AML
 			if (!method_scope.has_value())
 				return ParseResult::Failure;
 			method->term_list = method_pkg.value();
-			method->scope = method_scope.release_value();
+			method->scope = AML::NameString(method_scope.release_value());
 
 #if AML_DEBUG_LEVEL >= 2
 			method->debug_print(0);