printk: silence healthd messages from userspace

Constant messages about battery status every second doesn't help battery
or debugging.

[celtare21: Fix the memory leak]
Signed-off-by: kdrag0n <dragon@khronodragon.com>
Signed-off-by: celtare21 <celtare21@gmail.com>
Signed-off-by: Nancyjudge <botnancy1@gmail.com>