arm64: dts: rockchip: Enable eDP display for Cool Pi GenBook

Cool Pi CM5 GenBook equipped with a 1080P eDP panel, the panel
connected on board with 30/40 pin connector.

There is no hpd hooked up on the board, so we need to set
hpd-absent-delay-ms in dts.

Signed-off-by: Andy Yan <andyshrk@163.com>
Link: https://lore.kernel.org/r/20250426071554.1305042-2-andyshrk@163.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>