dt-bindings: display: simple: add EDT compatibles already supported by the driver

Some EDT compatibles are already supported by the driver but will fail
on checkpatch script. Fix it by syncing dt-bindings documentation with the
driver.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>