BHV-14734: Remove asyncMethod call and added comment.

### Issue
Adding missing commit to remove `asyncMethod` call. This was supposed to be part of https://github.com/enyojs/moonstone/pull/1649.

### Fix
We remove the `asyncMethod` call to prevent a hitch upon loading of `moon.Marquee` controls and to prevent a performance hit.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>