Revert "evoker: Enable backlight control"
Revert "evoker: Enable backlight control"

This reverts commit 003f969d94550ee09c3de16de6430fd7c98f4a10.

Reason for revert: changed backlight brightness to PMIC control

Original change's description:
> evoker: Enable backlight control
>
> Enable backlight control
>
> BUG=b:241512602
> BRANCH=none
> TEST=zmake build evoker
>
> Signed-off-by: Yu-An Chen <3408ceec56c33f5f3e599c74de364b5b60768bb8@quanta.corp-partner.google.com>
> Change-Id: Ib8a542cfb1732b5ce65397ecdc2870c8b3708f15
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3826465
> Reviewed-by: Wai-Hong Tam <waihong@google.com>
> Commit-Queue: Wai-Hong Tam <waihong@google.com>

Bug: b:241512602 b:249434213
Change-Id: Ia191c4a0245fc2443ab40166c9304f822aa67e60
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3935727
Auto-Submit: Yu-An Chen <3408ceec56c33f5f3e599c74de364b5b60768bb8@quanta.corp-partner.google.com>
Tested-by: Yu-An Chen <3408ceec56c33f5f3e599c74de364b5b60768bb8@quanta.corp-partner.google.com>
Reviewed-by: Bob Moragues <f5049d5b5df4f96d121308a63d9e3c0dfa5ed2dc@chromium.org>
Commit-Queue: Bob Moragues <f5049d5b5df4f96d121308a63d9e3c0dfa5ed2dc@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec