dt-bindings: display: simple: Document Displaytech DT050BTFT-PTS panel

dt-bindings: display: simple: Document Displaytech DT050BTFT-PTS panel

Document the Displaytech DT050BTFT-PTS 5.0" (800x480) color TFT LCD
panel, connected over DPI. The datasheet from 16 Nov 2023 is available
from Seacomp:

https://www.seacomp.com/sites/default/files/datasheets/DT050BTFT-Displaytech-Spec.pdf

Signed-off-by: Marek Vasut <marex@nabladev.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260422210806.80948-2-marex@nabladev.com