healthd: Check if battery device exists instead of charger drivers before setting fake properties. am: 9cb3d3ccf4 am: f2ca669e80 am: 6e394f0f6c
am: 8b38bcc915

* commit '8b38bcc915f9e7346a418bb71b63f037ea4fcadd':

Change-Id: I9486371f86e5230da85f4168cae36be06c26f297