Allow binding to amp-selector option[disabled]

### Description

#13036 fixed it such that `` supported binding to the `disabled` attribute.

The [docs](https://amp.dev/documentation/components/amp-selector/#disabled,-selected) say that options can also be disabled but apparently not via binding:

`[object HTMLDivElement]: Binding to [%s] on <%s> is not allowed. amp-bind disabled DIV`

when I try to do:

```html

```

and yet it works fine for me to do:

```html

```

### Alternatives Considered

I am currently working around this by using a bound class which applies `pointer-events: none`:

```html

```

### Additional Context

In my case, this is essential as I need to be able to disable all other options once a threshold has been reached.

Start by reproducing the reported amp-selector example with a bound disabled attribute, then trace how amp-bind validates bindings on option elements. Done means an option's disabled state can be controlled through binding as described, without the reported error, while preserving the existing static disabled behavior.

Written by the indexing model from the issue text.