dt-bindings: display: rockchip: Add no-hpd for dw-hdmi-qp controller

Add an attribute of "no-hpd" for the Rockchip dw-hdmi-qp controller.
This is used to describe implementations where the HPD pin is not
connected or used for other purposes, such as in the RK3588S based
Gameforce Ace which repurposed the GPIO for an additional face
button.

The "no-hpd" option was chosen to be consistent with other devices
which already define this parameter for broken or missing hpd
functionality.

Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Chris Morgan <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

Documentation/devicetree/bindings/display/rockchip/rockchip,rk3588-dw-hdmi-qp.yaml

···
       - const: main
       - const: hpd
 
+  no-hpd:
+    type: boolean
+    description:
+      The HPD pin is not present or used for another purpose, and the EDID
+      must be polled instead to determine if a device is attached.
+
   phys:
     maxItems: 1
     description: The HDMI/eDP PHY