Enables multiple clickable links on the SaveUi

Enables multiple links for URLSpan on description TextViews. Also fixes
issue about cannot restore the save UI while back from the activity which
URLSpan launched.

Bug: 133515042
Test: manual
Test: atest CtsAutoFillServiceTestCases
Change-Id: I8a97c2eaccdde78622b5b5432c9b00ce19d871df