Rename PromptContentListItem to PromptContentItem.

Test: atest BiometricPromptRequestTest
Test: atest PromptViewModelTest
Test: manual test - add content view manullay and test on biometric test app
Flag: ACONFIG android.hardware.biometrics.custom_biometric_prompt DEVELOPMENT
Bug: 320461893
API-Coverage-Bug: 302735104

Change-Id: I68437e42cd176cd4ada9663650c13bf0a6c856ba