Disable combined controller only if all modalities require consent

Additionally, ensure that consent is only requested for modalities
that have not been previously consented to. We retrieve the consent
requirement (which come from DPM) in onActivityResult instead of
onCreate, since the signal may not be ready immediately.

Fixes: 196060286
Fixes: 204592495
Test: make -j56 RunSettingsRoboTests ROBOTEST_FILTER=CombinedBiometricStatusPreferenceControllerTest

Change-Id: I984e61f28ffbf957c16cac4ea84f40b6ad7d8ae9