Set component name only for ConfirmDeviceCredentialActivity.

1. Rename setComponentNameForConfirmDeviceCredentialActivity() to
   setRealCallerForConfirmDeviceCredentialActivity()
2. Move the call from BiometricFragment to
   ConfirmDeviceCredentialActivity.

Flag: EXEMPT bugfix
Bug: 339532378
Test: manual test
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:3d357eedb80fd93d6ae2e1c41a20c40fe0c1670b)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f9186b35eee220a91009b4cb68722635760c1bd6)
Merged-In: I762f280def79d428ed9cf119ace5ccc2b6be2560
Change-Id: I762f280def79d428ed9cf119ace5ccc2b6be2560