Battery: New sysfs to selectively disable charge-safety-timer.

Battery: New sysfs to selectively disable charge-safety-timer.

BZ: 34016

Adding a new sysfs to disable charge-safety-timer.
Safety-timer will be enabled by default.

Change-Id: I3fd758efee1fabab88d3f23b0383a8a2c53e43c8
Signed-off-by: Pavan Kumar S <pavan.kumar.s@intel.com>
Reviewed-on: http://android.intel.com:8080/47802
Reviewed-by: Pallala, Ramakrishna <ramakrishna.pallala@intel.com>
Reviewed-by: Gowdar, GurumurthyX <gurumurthyx.gowdar@intel.com>
Reviewed-by: Tc, Jenny <jenny.tc@intel.com>
Reviewed-by: Singh, NavjotX <navjotx.singh@intel.com>
Tested-by: Kallappa Manjanna, MadhukumarX <madhukumarx.kallappa.manjanna@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>