Revert of Moved ambient lights out of SkLight's light array (patchset #7 id:120001 of https://codereview.chromium.org/2287553002/ )

Reason for revert:
Made Deigo's GM miss their ambient lights

Original issue's description:
> Moved ambient lights out of SkLight's light array
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2287553002
>
> Committed: https://skia.googlesource.com/skia/+/8f98f0aa2d3f7571a890b916c7c4b5ee831e9686

TBR=robertphillips@google.com,djsollen@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review-Url: https://codereview.chromium.org/2291663002
14 files changed