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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Idad052631dfdc9e818afb2c1e152fe5f0d1d768d