services: battery: Don't blink with an hvdcp charger

Quick charging doesn't really turn the device into a ticking time bomb
so there is no use in frantically blinking the led while charging.

This is a partial revert of the lights changes in a qualcomm commit
(ec43b6d8).

Change-Id: I42fdaa4a0af1bfa96c598b4209cbe9936d0de35d
Ticket: MARMITE-441