Fix CredDesc reg flow bugs

Fixed the issue caused by intent creation without system context and the
npe caused by null action chip list. Dropping then restoring caller id
before intent creation and passing an empty list to avoid npe.
Using uuid to distinguish different cred options in session.

Bug: 287538489
Bug: 287529343
Bug: 287689739
Test: local
Change-Id: I5612dd0f08a90a762c5ca5794a55a7abccecad2f