Refactor common implementation for health storage HAL. am: 9c160b61fe am: df620cbb2c am: 91160a8acc

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1548962

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If1d1909edd023d2e27f660b63c23b4940b407125