[TIMOB-13892] iOS: Accessibility - Label.accessibilityLabel does not work properly inside a ScrollView properly

Label.accessibilityLabel does not work properly inside a ScrollView properly i.e. the device's VoiceOver will not read the label. This is not a regression. Issue also exist on SDK 3.1.0 *Steps:* 1. Create a Titanium app with the following app.js code:

var _window = Ti.UI.createWindow({
    backgroundColor: 'white'
});

var scroll1 = Ti.UI.createScrollView({
    backgroundColor : 'red',
    accessibilityLabel : 'This is ScrollView1',
    accessibilityValue : 'Value1',
    accessibilityHint : 'hint 1',
    height : 200,
    top : 0
});
var label1 = Ti.UI.createLabel({
    text : 'Label Text',
    accessibilityLabel : 'Label on first Scrollview'
});
scroll1.add(label1);

_window.add(scroll1);

_window.open();

2. Install app to device. Make sure VoiceOver is on: Settings > General > Accessibility > VoiceOver > On 3. Double-press on app to launch app 4. Double-press on the label *Actual:* "Label on first Scrollview" is not read out. *Expected:* "Label on first Scrollview" should be read out.