healthd: grant perms from domain_deprecated

In preparation of removing permissions from domain_deprecated.

Addresses:
avc: denied { read } for name="present" dev="sysfs" ino=5003 scontext=u:r:healthd:s0 tcontext=u:object_r:sysfs:s0 tclass=file
avc: denied { open } for path="/sys/devices/platform/htc_battery_max17050.8/power_supply/flounder-battery/present" dev="sysfs" ino=5003 scontext=u:r:healthd:s0 tcontext=u:object_r:sysfs:s0 tclass=file

Change-Id: Iaee5b79a45aedad98e08c670addbf444c984165e