Update comments for IBiometricsFingerprint@2.3

This CL adds a comment that discourages use of this interface. The AIDL
interface, IFingerprint, should be used instead.

Bug: 160189286
Test: hidl-gen -L check android.hardware.biometrics.fingerprint@2.3::IBiometricsFingerprint
Change-Id: Ifafb191ac16e03e60d677fce6dc9e41e87bad0c0
2 files changed