Adjust UDFPS prompt for 3-button nav and landscape

Modifies the layout of BiometricPrompt for under-display fingerprint
sensors so that the fingerprint icon is aligned with the sensor when the
device is in the landscape orientation and/or using 3-button navigation.

Test: atest AuthBiometricViewTest
Test: Manually, using the biometric integration test app

Bug: 179044674
Change-Id: I4da075b4cbf8b7119c071361336ddebd0a505ce0