Revert "hammerhead: add charging led support"

This reverts commit f17a47b324fef98dde471620a8f7dd98d72557a8.
hammerhead: add charging led support

Also introduces led priority handling for
battery vs notification vs attention
(copied from jf-common).

Requires the hammerhead kernel led
always on support patch.

Change-Id: I1a2f3aae457c6d7e4e3c3f9ca39cbe42d39c3bc2
fix a derp ture is true