[BHV-16348]Issue of co-existing Popup and contextual popup

Issue: Z-index of scrim and popup increases based on moon.Popup.count
value. So in moon popup there is no visibility of other enyo popups.
Fix: Implemenation is changed to use enyo.Popup.count to fix the
dependency problems of all popups extended from enyo.popup
DCO-1.1-Signed-Off-By: Rajyavardhan P <rajyavardhan.p@lge.com>