scripts: kconfig: add dt_node_parent kconfig function

   $(dt_node_str_prop_equals,<node path>,<prop>,<value>)

   $(dt_nodelabel_has_compat,<node label>,<compatible string>)

   $(dt_nodelabel_path,<node label>)

   $(dt_node_parent,<node path>)

   $(shields_list_contains,<shield name>)

    return node.path if node else ""

def dt_node_parent(kconf, _, path):

    """

    This function takes a 'path' and looks for an EDT node at that path. If it

    finds an EDT node, it will look for the parent of that node. If the parent

    exists, it will return the path to that parent. Otherwise, an empty string

    will be returned.

    """

    if doc_mode or edt is None:

        return ""

    try:

        node = edt.get_node(path)

    except edtlib.EDTError:

        return ""

    if node is None:

        return ""

    return node.parent.path if node.parent else ""

def shields_list_contains(kconf, _, shield):

    """

        "dt_node_str_prop_equals": (dt_node_str_prop_equals, 3, 3),

        "dt_nodelabel_has_compat": (dt_nodelabel_has_compat, 2, 2),

        "dt_nodelabel_path": (dt_nodelabel_path, 1, 1),

        "dt_node_parent": (dt_node_parent, 1, 1),

        "shields_list_contains": (shields_list_contains, 1, 1),

}