health: batteryStateOfHealth should be a property am: 39c564112b am: 2625f103ea

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2441528

Change-Id: I71da18bfb5b1934924cb3ba613a7e9a4cd4bc470
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>