Add placeholder for error dialog dismisses code

This is for error dialog dismissal signal. A placeholder in
BiometricConstants in the framework should be added even though it is
not used, so that AndroidX constants could keep consistent with the
framework. Simlar to BIOMETRIC_ERROR_NEGATIVE_BUTTON.

Bug: 375693808
Test: N/A
Flag: EXEMPT bug fix - add an internal error code

Change-Id: I3c5666784db0635ae4373189e0b3ee2c7c51eacb