Add HAL-to-framework constant conversion

This CL adds functions to fingerprint's and face's AidlConversionUtils
that map HAL-level constants to the framework constants. This makes the
layers independent from the numerical values of the constants,
which makes it easier to add new constants in the future.

Bug: 181358178
Test: atest CtsBiometricsTestCases
Change-Id: Ia9864eb7dae7933cc02b2019117bc590d3f30184