Revert "Use stock lights hal for now"

This reverts commit 3091f9b5ec99c922a934394dbe867589d54346db.
msm8974-common: lights: Support find7s

Implement DT based LED detection and control.  See kernel docs at
Documentation/devicetree/bindings/leds/leds-qpnp.txt.

Change-Id: Ib52ba033cde4c257e115f8b92934301ca6b49e02