CDD: Lockscreen and biometrics changes

- Introducing new biomatrics tier model, adding
 the requirements and constraints for each tier.
- Some editorial changes by reorganizing and folding some sections
- Transferred ag/6940471 on master to qt-branch

Bug: 126002559
Bug: 120995257 (7.3.10/C-2-5)
Bug: 124243324 (9.11.1/C-7-12)
Bug: 124403616 (7.3.10 additional background)
Bug: 123365828 (9.11.1/C-7-11)
Test: NA

Change-Id: Ib36d40935c77ec370a2494ddb1506b0a952fd525
2 files changed