dt-bindings: display: ti,am65x-dss: Add support for AM62L DSS

dt-bindings: display: ti,am65x-dss: Add support for AM62L DSS

The DSS controller on TI's AM62L SoC is an update from that on TI's
AM625/AM65x/AM62A7 SoC. The AM62L DSS [1] only supports a single display
pipeline using a single overlay manager, single video port and a single
video lite pipeline which does not support scaling.

The output of video port is routed to SoC boundary via DPI interface and
the DPI signals from the video port are also routed to DSI Tx controller
present within the SoC.

[1]: Section 11.7 (Display Subsystem and Peripherals)
Link : https://www.ti.com/lit/pdf/sprujb4

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Jayesh Choudhary <j-choudhary@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Link: https://lore.kernel.org/r/20250507180631.874930-2-devarsht@ti.com
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>