dt-bindings: Add support for Samsung s6e3ha2 panel binding

The Samsung s6e3ha2 is a 5.7" 1440x2560 AMOLED panel connected using
MIPI-DSI interfaces.

Signed-off-by: Donghwa Lee <dh09.lee@samsung.com>
Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com>
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>