drm/panel: add rotation support for Elida KD35T133 panels

Update the panel to allow setting the rotation value in device tree.
Tested on an Odroid Go Advance, where the panel is by default rotated 270
degrees.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/SN6PR06MB534253E1CFDEA6917230F57BA57A9@SN6PR06MB5342.namprd06.prod.outlook.com