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

healthd.te

@@ -5,6 +5,9 @@ type healthd, domain, domain_deprecated;
 # Write to /dev/kmsg
 allow healthd kmsg_device:chr_file rw_file_perms;
 
+# Read access to pseudo filesystems.
+r_dir_file(healthd, sysfs)
+
 allow healthd self:capability { net_admin sys_tty_config };
 wakelock_use(healthd)
 allow healthd self:netlink_kobject_uevent_socket create_socket_perms;