DTS: imx: Add display5 board (imx6q based) device tree description (v5.1)

This commit ports from Linux kernel - tag: v5.1 - the device tree
description for display5 board.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>