Find7: update mixer paths from find7op
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
Find7: no need to bloat up dtimage twice
Find7: fix RIL class path