fix(select): add cssClass for popover interface (#11769)
fix(select): add cssClass for popover interface (#11769)

* fix(ionSelect): support cssClass for popover interface

* fix default cssClass value

TillaTheHun0/ionic,alan-agius4/ionic,driftyco/ionic,alan-agius4/ionic,alan-agius4/ionic,driftyco/ionic,driftyco/ionic,TillaTheHun0/ionic,alan-agius4/ionic,driftyco/ionic,alan-agius4/ionic,TillaTheHun0/ionic,TillaTheHun0/ionic,driftyco/ionic,alan-agius4/ionic