Add Temp Defend clear to server configurable parameters; ensure sysfs node is writable

Test: Ensure there are no errors on logcat | grep google_battery@
Bug: 192921867
Change-Id: Ib16af35a503d0a4993412f0d30ee1afce708488d

Author: Stephane Lee

init.hardware.rc

@@ -126,6 +126,7 @@ on init && property:vendor.skip.init=0
     chown system system /sys/devices/platform/soc/soc:google,charger/bd_trigger_voltage
     chown system system /sys/devices/platform/soc/soc:google,charger/bd_temp_enable
     chown system system /sys/devices/platform/soc/soc:google,charger/bd_temp_dry_run
+    chown system system /sys/devices/platform/soc/soc:google,charger/bd_clear
     chown system system /sys/devices/platform/soc/soc:google,battery/power_supply/battery/bd_trickle_enable
     chown system system /sys/devices/platform/soc/soc:google,battery/power_supply/battery/bd_trickle_recharge_soc
     chown system system /sys/devices/platform/soc/soc:google,battery/power_supply/battery/bd_trickle_cnt