settings: Deprecate has_led_flash, move to framework.

 * We need this to configure default tiles in SystemUI so move it.
 * Leave the old one in place so we don't kill every device.

Change-Id: I883f9595f74ab52c8c8152e0105400aaefff4afe
Merge pull request #14 from CyanogenMod/cm-10.2

settings: Deprecate has_led_flash, move to framework.