Change ownership of charge_stats to system for clearing

Test: Tested with tablet with dock. Userspace is able to read
and clear sysfs node successfully

Bug: 218802317
Signed-off-by: Prasanna Prapancham <prapancham@google.com>
Change-Id: I1e97920ff0e810ce2888102f3971b21aabc55909
1 file changed