battery_mitigation may be kept in forever loop to read sysfs node. This
makes sure that the loop is exited after 10 tries.
Bug: 275028861
Test: Local boot up and ensure battery_mitigation comes up
Change-Id: I02936f4426519b2c9fbc776cdb2614fdeba872c0
Signed-off-by: George Lee <geolee@google.com>