Refactor the display of description text when no wifi calling options available.
Enhancement:
1. These text need to align the style with the summary part of the wifi
calling options.
2. These text need to be scrollable in order to see full description.
3. The link within text need to be clickable.
Bug: 204844012
Test: local
Change-Id: I60f339bf4adf50236d80176669a557c77f0d97ca
Replace the view of dialog with custom view that adds description
as summary.
Test: manual
Bug: 34793636
Change-Id: If9792b0a35c59c1260176b4b2c62107861de73b5
