FROMLIST: dt-bindings: display: mediatek: add binding for OUTPROC block on MT8196

Add binding to describe OUTPROC display block for MT8196.

OUTPROC is used to handle the post-stage of pixel processing in the
overlapping procedure. OVL_OUTPROC manages pixels for gamma correction
and ensures that pixel values are within the correct range.

Signed-off-by: Paul-pl.Chen <paul-pl.chen@mediatek.com>
(am from https://patchwork.kernel.org/patch/13935616/)
(also found at https://lore.kernel.org/r/20250110123835.2719824-7-paul-pl.chen@mediatek.com

)

BUG=b:384077322
TEST=emerge-rauru sys-kernel/chromeos-kernel-6_6
UPSTREAM-TASK=b:379039599

Signed-off-by: Paul-PL Chen <paul-pl.chen@mediatek.corp-partner.google.com>
Change-Id: If172e9934f427ec7493dd60f41e292a49a81d6b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/6181670


Reviewed-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Eric Yilun Lin <yllin@google.com>
Commit-Queue: Eric Yilun Lin <yllin@google.com>
Signed-off-by: Hubert Mazur <hmazur@google.com>