ARM: dts: imx6q-b850v3: Use megachips-stdpxxxx-ge-b850v3-fw bridges (LVDS-DP++)

Configures the megachips-stdpxxxx-ge-b850v3-fw bridges on the GE
B850v3 dts file.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Martyn Welch <martyn.welch@collabora.co.uk>
Cc: Martin Donnelly <martin.donnelly@ge.com>
Cc: Javier Martinez Canillas <javier@dowhile0.org>
Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>