Use GlifLayout#setDescriptionText in SetupChooseLockGenericFragment

1. Use GlifLayout#setDescriptionText to align UX.
2. Remove redundant layout resources.
3. Add two new robotests.

Bug: 236948821
Test: make RunSettingsRoboTests ROBOTEST_FILTER=SetupChooseLockGenericTest
Test: Check UI manually
Change-Id: I85cc984527fcc746e835d8fa508e78c96dfdcb94
4 files changed