locksettings: clean up logging of cached GK password expiration am: ad578e9b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21724589



Change-Id: I2c9b795e0b2c2fd19a6b3159b73470b780349002
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>