Implement list of maps

Allow property value to be a list of maps, e.g.
my_module {
  my_list: [
    { name: "foo", value: 42, something: true, },
    { name: "bar", value: 34, something: false, },
  ],
}

Test: internal
Change-Id: I2fc37d692aac39f23c9aa7bda2859ab49f3bc672