Healthd: charger: allow override of LED/BACKLIGHT paths

Change-Id: Ib7372e441d554e16ffc20ce43993ee78cdc5b187
set /system/etc/init.d/* permissions

ported from CM7

Change-Id: I279d78679f7d779d6cd6bbc6c834d94706937ae8
healthd: Detect power supply type for all charger devices

Power supply type is not determined via the device name,
hence iterate over all available devices in the subsystem
node and read the type from device file.

  shell@hammerhead:/ $ ls /sys/class/power_supply
  ac
  batt_therm
  battery
  touch
  usb
  wireless

<4>[ 3184.867782] healthd: touch: Unknown power supply type
<4>[ 3184.868039] healthd: batt_therm: Unknown power supply type
<6>[ 3184.880506] healthd: battery l=89 v=4181 t=25.5 h=2 st=2 c=-288 chg=u
<4>[ 3184.890362] healthd: touch: Unknown power supply type
<4>[ 3184.890549] healthd: batt_therm: Unknown power supply type
<6>[ 3184.899419] healthd: battery l=89 v=4181 t=25.5 h=2 st=2 c=-59 chg=u
<4>[ 3184.908756] healthd: touch: Unknown power supply type
<4>[ 3184.908984] healthd: batt_therm: Unknown power supply type
<6>[ 3184.919672] healthd: battery l=89 v=4181 t=25.6 h=2 st=2 c=-25 chg=u

Change-Id: I863bfab95193899460237b51997e0418eeb4ee2c